From 3fee4d5cf27a5c9b43a3ea560a5f591eaea5ade7 Mon Sep 17 00:00:00 2001
From: danry25 <adn5412@gmail.com>
Date: Mon, 8 Oct 2018 21:33:27 -0700
Subject: [PATCH] GXP2170 Provisioning File Improvements (#3628)

* Added the ability to pick the SIP account for the first two slots on each handset

* Revert to clean base

* Configurable firmware versions for the Grandstream DP750

* GXP2170 Config File improvements

* Added OpenVPN options back (but commented out), changed call waiting & vlan variables

* Readd Broadsoft Features, but commented out
---
 .../provision/grandstream/gxp2170/{$mac}.xml  | 1500 ++---------------
 1 file changed, 102 insertions(+), 1398 deletions(-)

diff --git a/resources/templates/provision/grandstream/gxp2170/{$mac}.xml b/resources/templates/provision/grandstream/gxp2170/{$mac}.xml
index 97f6e4552b..8655e3358a 100644
--- a/resources/templates/provision/grandstream/gxp2170/{$mac}.xml
+++ b/resources/templates/provision/grandstream/gxp2170/{$mac}.xml
@@ -3,7 +3,7 @@
 <gs_provision version="1">
 <mac>{$mac|replace:'-':''}</mac>
 <config version="1">
-<!-- ########################################################################################## -->
+<!-- ######################################################################################## -->
 <!-- ## Configuration Template For GXP2130/2140/2160/2170/2135 Firmware Version 1.0.9.26     ## -->
 <!-- ########################################################################################## -->
 
@@ -19,7 +19,6 @@
 <!-- ############################################################### -->
 <!-- # Account Active. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P271>1</P271>
 
 <!--  Account Name -->
@@ -40,7 +39,7 @@
 
 <!--  Backup Outbound Proxy -->
 <!--  String -->
-<P2333></P2333>
+<P2333>{$outbound_proxy_2}</P2333>
 
 <!--  BLF Server -->
 <!--  String -->
@@ -71,7 +70,6 @@
 <!-- ############################################################### -->
 <!-- # DNS Mode. 0 - A Record, 1 - SRV, 2 - NAPTR/SRV, 3 - Use Configured IP. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($grandstream_dns_mode)}
 <P103>{$grandstream_dns_mode}</P103>
 {else}
@@ -80,7 +78,6 @@
 
 <!-- # DNS SRV Fail-over Mode. 0 - Default, 1 - Saved one until DNS TTL, 2 - Saved one until no response. Default is 0 -->
 <!-- # Number: 0,1,2 -->
-<!-- # Mandatory -->
 <P26040>0</P26040>
 
 <!-- # Primary IP. Maximum 15 characters -->
@@ -97,7 +94,6 @@
 
 <!-- # NAT Traversal. 0 - No, 1 - STUN, 2 - keep alive, 3 - UPnP, 4 - Auto, 5 - VPN. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4, 5 -->
-<!-- # Mandatory -->
 {if isset($grandstream_nat_traversal)}
 <P52>{$grandstream_nat_traversal}</P52>
 {else}
@@ -113,74 +109,60 @@
 <!-- ############################################################### -->
 <!-- # TEL URI. 0 - Disabled, 1 - User=Phone, 2 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P63>0</P63>
 
 <!-- # SIP Registration. 0 - No, 1 - Yes. Default is 1 -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
+a!-- # Number: 0, 1 -->
 <P31>1</P31>
 
 <!-- # Unregister On Reboot. 0 - No, 1 - Yes, 2 - Instance. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P81>0</P81>
 
 <!-- # Register Expiration (in minutes). Default is 60. Max about 45 days -->
 <!-- # Number: 1 - 64800 -->
-<!-- # Mandatory -->
 <P32>{$register_expires_1}</P32>
 
 <!-- # Subscribe Expiration. Default is 60. Max about 45 days -->
 <!-- # Number: 1 - 64800 -->
-<!-- # Mandatory -->
 <P26051>60</P26051>
 
 <!-- # Reregister Before Expiration (in seconds). Default is 0 second -->
 <!-- # Number: 0 - 64800 -->
-<!-- # Mandatory -->
 <P2330>0</P2330>
 
 <!-- # Enable OPTIONS Keep Alive. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P2397>0</P2397>
 
 <!-- # OPTIONS Keep Alive Interval. Default is 30 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P2398>30</P2398>
 
 <!-- # OPTIONS Keep Alive Max Lost. Default is 3 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P2399>30</P2399>
 
 <!-- # Local SIP Port. Default is 5060 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P40>5060</P40>
 
 <!-- # SIP Registration Failure Retry Wait Time (in seconds). Default is 20 -->
 <!-- # Number: 1 - 3600 -->
-<!-- # Mandatory -->
 <P138>20</P138>
 
 <!-- # SIP T1 Timeout. RFC 3261 T1 value (RTT estimate) -->
 <!-- # 50 - 0.5 sec, 100 - 1 sec, 200 - 2 sec. Default is 50 -->
 <!-- # Number: 50, 100, 200 -->
-<!-- # Mandatory	 -->
 <P209>50</P209>
 
 <!-- # SIP T2 Timeout. RFC 3261 T2 value. The maximum retransmit interval for non-INVITE requests and INVITE responses -->
 <!-- # 200 - 2 sec, 400 - 4 sec, 800 - 8 sec. Default is 400 -->
 <!-- # Number: 200, 400, 800 -->
-<!-- # Mandatory -->
 <P250>400</P250>
 
 <!-- # SIP Transport. 0 - UDP, 1 - TCP, 2 - TLS/TCP. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 {$tp=0}
 {if $sip_transport_1 == 'udp'}{$tp=0}{/if}
 {if $sip_transport_1 == 'tcp'}{$tp=1}{/if}
@@ -191,32 +173,26 @@
 <!-- # SIP Listening Mode.  -->
 <!-- # 0 - Transport Only, 1 - Dual, 2 - Dual (BLF Enforced), 3 - Dual (Secured). Default is 0 -->
 <!-- # Number: 0,1,2,3 -->
-<!-- # Mandatory -->
 <P26024>0</P26024>
 
 <!-- # SIP URI Scheme when using TLS. 0 - sip, 1 - sips. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2329>1</P2329>
 
 <!-- # Use Actual Ephemeral Port in Contact with TCP/TLS. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2331>0</P2331>
 
 <!-- # Outbound Proxy Mode. 0 - in route, 1 - not in route, 2 - always send to -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2305>0</P2305>
 
 <!-- # Support SIP Instance ID. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P288>1</P288>
 
 <!-- # SUBSCRIBE for MWI. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($subscribe_mwi)}
 <P99>1</P99>
 {else}
@@ -225,40 +201,33 @@
 
 <!-- # SUBSCRIBE for Registration. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2319>0</P2319>
 
 <!-- # Enable 100rel. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P272>0</P272>
 
 <!-- # Callee ID Display. 0 - Auto, 1 - Disabled, 2 - From Header. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26025>0</P26025>
 
 <!-- # Caller ID Display. 0 - Auto, 1 - Disabled, 2 - From Header. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2324>0</P2324>
 
 <!-- # Add Auth Header On Initial REGISTER -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2359>0</P2359>
 
 <!-- # Allow SIP Reset -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26015>0</P26015>
 
 <!-- # Ignore Alert-Info header -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26018>0</P26018>
 
 <!-- ############################################################### -->
@@ -268,37 +237,31 @@
 <!-- # Use Privacy Header -->
 <!-- # 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2338>0</P2338>
 
 <!-- # Use P-Preferred-Identity Header -->
 <!-- # 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2339>0</P2339>
 
 <!-- # Use X-Grandstream-PBX Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26054>1</P26054>
 
 <!-- # Use P-Access-Network-Info Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26058>1</P26058>
 
 <!-- # Use P-Emergency-Info Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26059>1</P26059>
 
 <!-- # Use MAC Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26061>1</P26061>
 
 <!-- ############################################################### -->
@@ -306,16 +269,10 @@
 <!-- ############################################################### -->
 <!-- # Line-Seize Timeout (in seconds). Default is 15 -->
 <!-- # Number: 15 - 60 -->
-<!-- # Mandatory -->
 <P2313>15</P2313>
 
-<!-- # Eventlist BLF URI -->
-<!-- # String -->
-<P134></P134>
-
 <!-- #Auto Provision Eventlist BLFs. 0-Disabled, 1-Enabled. Default is 0 -->
 <!-- #Number:0,1 -->
-<!-- #Mandatory -->
 <P2389>0</P2389>
 
 <!-- # Conference URI -->
@@ -328,12 +285,10 @@
 
 <!-- # Force BLF Call-pickup by prefix. 0 - Disable, 1 - Enable. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P6752>0</P6752>
 
 <!-- # BLF Call-pickup Prefix. Default is ** -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P1347>**</P1347>
 
 <!-- # Call Pickup Barge-In Code -->
@@ -342,105 +297,61 @@
 
 <!-- # PUBLISH for Presence. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P188>0</P188>
 
 <!-- # Omit charset=UTF-8 in MESSAGE. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2355>0</P2355>
 
 <!-- # Allow Unsolicited REFER. 0 - Disabled, 1 - Enabled, 2 - Enabled/Force Auth. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26023>0</P26023>
 
 <!-- # Special Feature. 100 - Standard, 101 - Nortel MCS, 102- Broadsoft, 108 - CBCOM,  -->
 <!-- # 109 - RNK, 110 - Sylantro, 117 - Huawei IMS, 119 - Phonepower -->
 <!-- # Default is 100 -->
 <!-- # Number: 100, 101, 102, 108, 109, 110, 117, 119 -->
-<!-- # Mandatory -->
 <P198>100</P198>
 
-<!-- # Broadsoft -->
-<!-- # Broadsoft Call Center. 0 - No, 1 - Yes. Default is 0 -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2341>0</P2341>
-
-<!-- # Hoteling Event. 0 - No, 1 - Yes. Default is 0 -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2342>0</P2342>
-
-<!-- # Call Center Status. 0 - No, 1 - Yes. Default is 0 -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2343>0</P2343>
-
-<!-- # Broadsoft Executive Assistant. 0 - Disabled, 1 - Enabled. Default is 0 -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2364>0 </P2364>
-
-<!-- # Feature Key Synchronization. 0 - Disabled, 1 - Enabled. Default is 0 -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2325>0</P2325>
-
-<!-- # Broadsoft Call Park. 0 - Disabled, 1 - Enabled. Default is 0 -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2388>0</P2388>
-
 <!-- ############################################################### -->
 <!-- # Account 1/SIP Settings/Session Timer -->
 <!-- ############################################################### -->
 <!-- # Enable Session Timer. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2395>1</P2395>
 
 <!-- # Session Expiration (in seconds). Default is 180 -->
 <!-- # Number: 90 - 64800 -->
-<!-- # Mandatory -->
 <P260>180</P260>
 
 <!-- # Minimum SE (in seconds). Default is 90. This value must be lower than or equal to P260 -->
 <!-- # Number: 90 - 64800 -->
-<!-- # Mandatory -->
 <P261>90</P261>
 
 <!-- # Caller Request Timer (Request for timer when calling). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P262>0</P262>
 
 <!-- # Callee Request Timer (Request for timer when called. i.e. if remote party supports timer but did not request for one) -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P263>0</P263>
 
 <!-- # Force Timer (Still use timer when remote party does not support timer). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P264>0</P264>
 
 <!-- # UAC Specify Refresher. 0 - omit, 1 - UAC, 2 - UAS. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P266>0</P266>
 
 <!-- # UAS Specify Refresher. 1 - UAC, 2 - UAS. Default is 1 -->
 <!-- # Number: 1, 2 -->
-<!-- # Mandatory -->
 <P267>1</P267>
 
 <!-- # Force INVITE (Always refresh with INVITE instead of UPDATE even when remote party supports UPDATE). -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P265>0</P265>
 
 <!-- ############################################################### -->
@@ -449,32 +360,51 @@
 <!-- # Check Domain Certificates. When set to Yes/Enabled, domain certificate will be checked as defined in RFC5922 -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2311>0</P2311>
 
+<!-- # Broadsoft Features, might be useful in the future -->
+<!-- # Broadsoft Call Center. 0 - No, 1 - Yes. Default is 0 -->
+<!-- # Number: 0, 1 -->
+<!-- <P2341>0</P2341> -->
+<!-- # Hoteling Event. 0 - No, 1 - Yes. Default is 0 -->
+<!-- # Number: 0, 1 -->
+<!-- # Mandatory -->
+<!-- <P2342>0</P2342> -->
+<!-- # Call Center Status. 0 - No, 1 - Yes. Default is 0 -->
+<!-- # Number: 0, 1 -->
+<!-- # Mandatory -->
+<!-- <P2343>0</P2343> -->
+<!-- # Broadsoft Executive Assistant. 0 - Disabled, 1 - Enabled. Default is 0 -->
+<!-- # Number: 0, 1 -->
+<!-- # Mandatory -->
+<!-- <P2364>0 </P2364> -->
+<!-- # Feature Key Synchronization. 0 - Disabled, 1 - Enabled. Default is 0 -->
+<!-- # Number: 0, 1 -->
+<!-- # Mandatory -->
+<!-- <P2325>0</P2325> -->
+<!-- # Broadsoft Call Park. 0 - Disabled, 1 - Enabled. Default is 0 -->
+<!-- # Number: 0, 1 -->
+<!-- # Mandatory -->
+<!-- <P2388>0</P2388> -->
+
 <!-- # Validate Certification Chain. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2367>0</P2367>
 
 <!-- # Validate Incoming Messages. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2306>0</P2306>
 
 <!-- # Check SIP User ID for incoming INVITE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P258>0</P258>
 
 <!-- # Accept Incoming SIP from Proxy Only. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2347>1</P2347>
 
 <!-- # Authenticate Incoming INVITE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2346>0</P2346>
 
 <!-- ############################################################### -->
@@ -484,69 +414,56 @@
 <!-- # 0 - PCMU, 2 - G.726-32, 8 - PCMA, 9 - G.722, 18 - G.729A/B, 4 - G.723.1, 98 - iLBC, 125 - OPUS -->
 <!-- # choice 1. Default is 0 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125 -->
-<!-- # Mandatory -->
 <P57>0</P57>
 
 <!-- # choice 2. Default is 8 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P58>8</P58>
 
 <!-- # choice 3. Default is 4 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P59>4</P59>
 
 <!-- # choice 4. Default is 18 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125 -->
-<!-- # Mandatory -->
 <P60>18</P60>
 
 <!-- # choice 5. Default is 9 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P61>9</P61>
 
 <!-- # choice 6. Default is 98 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P62>98</P62>
 
 <!-- # choice 7. Default is 2 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P46>2</P46>
 
 <!-- # choice 8. Default is 125 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P98>125</P98>
 
 <!-- # Use First Matching Vocoder in 200OK SDP. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2348>0</P2348>
 
 <!-- # Codec Negotiation Priority. 0 - Caller, 1 - Callee. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P29061>1</P29061>
 
 <!-- # Hide Vocoder. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P26047>0</P26047>
 
 <!-- # Disable Multiple m line in SDP -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P137>0</P137>
 
 <!-- # SRTP Mode. 0 - Disabled, 1 - Enabled but not forced, 2 - Enabled and forced, 3 - Optional. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($grandstream_srtp)}
 <P183>{$grandstream_srtp}</P183>
 {else}
@@ -556,89 +473,72 @@
 <!-- # SRTP Key Length. 0 - AES 128&256 bit, 1 - AES 128 bit, 2 - AES 256 bit. Default is 0 -->
 <!-- # Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P2383>0</P2383>
 
 <!-- #Crypto Life Time -->
 <!-- #0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2363>0</P2363>
 
 <!-- # Symmetric RTP. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P291>0</P291>
 
 <!-- # Silence Suppression. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P50>0</P50>
 
 <!-- # Jitter Buffer Type. 0 - Fixed, 1 - Adaptive. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P133>1</P133>
 
 <!-- # Jitter Buffer Length. 0 - 100ms, 1 - 200ms, 2 - 300ms, 3 - 400ms, 4 - 500ms, 5 - 600ms, 6 - 700ms, 7 - 800ms -->
 <!-- # Default is 2 -->
 <!-- # Number: 0, 1, 2, 3, 4, 5, 6, 7 -->
-<!-- # Mandatory -->
 <P132>2</P132>
 
 <!-- # Voice Frames per TX (up to 10/20/32/64 frames for G711/G726/G723/other codecs respectively). Default is 2 -->
 <!-- # Number: 1 - 64 -->
-<!-- # Mandatory -->
 <P37>2</P37>
 
 <!-- # G723 Rate. 0 - 6.3kbps encoding rate, 1 - 5.3kbps encoding rate. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P49>1</P49>
 
 <!-- # G.726-32 Packing Mode. 0 - ITU, 1 - IETF. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2323>0</P2323>
 
 <!-- # iLBC Frame Size. 0 - 20ms, 1 - 30ms. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P97>1</P97>
 
 <!-- # iLBC Payload Type. Default is 97 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P96>97</P96>
 
 <!-- # OPUS Payload Type. Default is 123 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P2385>123</P2385>
 
 <!-- # DTMF Payload Type. Default is 101 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P79>101</P79>
 
 <!-- # Send DTMF: In-audio. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2301>0</P2301>
 
 <!-- # Send DTMF: Via RTP (RFC2833). 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2302>1</P2302>
 
 <!-- # Send DTMF: Via SIP INFO. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2303>0</P2303>
 
 <!-- # DTMF Delay. Default is 250 -->
 <!-- # Number: 100 - 250 -->
-<!-- # Mandatory -->
 <P26060>250</P26060>
 
 <!-- ############################################################### -->
@@ -646,7 +546,6 @@
 <!-- ############################################################### -->
 <!-- # Early Dial (use "Yes" only if proxy supports 484 response). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P29>0</P29>
 
 <!-- # Dial Plan Prefix -->
@@ -655,19 +554,16 @@
 
 <!-- # Dial Plan. Default value is { x+ | \+x+ | *x+ | *xx*x+ } -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P290>{$grandstream_dial_plan}</P290>
 
 <!-- # Call Log. 0 - Log All Calls, 1 - Log Incoming/Outgoing only (missed calls NOT recorded), 2 - Disable Call Log. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
-<P182>0</P182>
+<!-- <P182>0</P182> -->
 
 <!-- # Account Ring Tone. 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone, 4 - silent. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
-{if isset($grandstream_account_ring_tone_1)}
-<P104>{$grandstream_account_ring_tone_1}</P104>
+{if isset($grandstream_default_ringtone)}
+<P104>{$grandstream_default_ringtone}</P104>
 {/if}
 
 <!-- # Matching Incoming Caller ID. Matching Rule 1 -->
@@ -677,7 +573,6 @@
 <!-- # Matching Rule 1 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1489>1</P1489>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 2 -->
@@ -687,77 +582,63 @@
 <!-- # Matching Rule 2 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1491>2</P1491>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 3 -->
 <!-- # String -->
-<P1492></P1492>
+<P1492>ring3</P1492>
 
 <!-- # Matching Rule 3 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1493>3</P1493>
 
 <!-- # Ring Timeout (in seconds). Default is 60 -->
 <!-- # Number: 30 - 3600 -->
-<!-- # Mandatory -->
 <P1328>60</P1328>
 
 <!-- # Send Anonymous (caller ID will be blocked if set to Yes). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P65>0</P65>
 
 <!-- # Anonymous Call Rejection. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P129>0</P129>
 
 <!-- # Auto Answer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P90>0</P90>
 
 <!-- # Refer-To Use Target Contact. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P135>0</P135>
 
 <!-- # Transfer on Conference HangUp. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2304>0</P2304>
 
 <!-- # Disable Recovery on Blind Transfer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2384>1</P2384>
+<P2384>0</P2384>
 
 <!-- # Blind Transfer Wait Timeout. Default is 30 -->
 <!-- # Number: 30 - 300 -->
-<!-- # Mandatory -->
 <P26070>30</P26070>
 
 <!-- # No Key Entry Timeout (in seconds). Default is 4 -->
 <!-- # Number: 1 - 15 -->
-<!-- # Mandatory -->
 <P85>4</P85>
 
 <!-- # Key as Send. 0 - Disabled, 1 - Pound (#), 2 - Star (*). Default is 1 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P72>1</P72>
 
 <!-- # On Hold Reminder Tone. 0 - Disabled, 1 - Enable. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26006>0</P26006>
 
 <!-- # RFC2543 Hold. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26062>1</P26062>
 
 <!-- # Hiding Dialing Password -->
@@ -767,35 +648,29 @@
 
 <!-- # Password length. Default is 0 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P26050>0</P26050>
 
 <!-- # Disable Call Waiting. 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
-<P26063>0</P26063>
+<P26063>{$grandstream_call_waiting}</P26063>
 
 <!-- ############################################################### -->
 <!-- # Account 1/Intercom Settings -->
 <!-- ############################################################### -->
 <!-- # Allow Auto Answer by Call-Info/Alert-Info. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P298>0</P298>
+<P298>1</P298>
 
 <!-- # Allow Barging by Call-Info/Alert-Info. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26019>0</P26019>
 
 <!-- # Mute on answer Intercom call. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26071>0</P26071>
 
 <!-- # Play warning tone for Auto Answer Intercom. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26072>0</P26072>
 
 <!-- # Custom Call-Info for Auto Answer. -->
@@ -807,47 +682,9 @@
 <!-- ############################################################### -->
 <!-- #Enable Call Features.  0 - No, 1 - Yes. Default is 1 -->
 <!-- #Number: 0, 1  -->
-<!-- #Mandatory -->
 <!-- # This must be 0 for FusionPBX features to work!!! -->
 <P191>0</P191>
 
-<!-- #Do Not Disturb (DND) - On -->
-<!-- # String -->
-<P2344></P2344>
-
-<!-- #Do Not Disturb (DND) - Off -->
-<!-- # String -->
-<P2345></P2345>
-
-<!-- #Call Forward Unconditionally (All) - On -->
-<!-- # String -->
-<P26013></P26013>
-
-<!-- #Call Forward Unconditionally (All) - Off -->
-<!-- # String -->
-<P26014></P26014>
-
-<!-- #Call Forward Busy - On -->
-<!-- # String -->
-<P26009></P26009>
-
-<!-- #Call Forward Busy - Off -->
-<!-- # String -->
-<P26010></P26010>
-
-<!-- #Call Forward Delayed (No Answer) - On -->
-<!-- #String -->
-<P26011></P26011>
-
-<!-- #Call Forward Delayed (No Answer) - Off -->
-<!-- #String -->
-<P26012></P26012>
-
-<!-- #Delayed Call Forward Wait Time (in seconds). Default is 20 -->
-<!-- #Number: 1 - 120 -->
-<!-- #Mandatory -->
-<P139>20</P139>
-
 <!-- #################################################################### -->
 <!-- # Account 2 -->
 <!-- #################################################################### -->
@@ -856,7 +693,6 @@
 <!-- ############################################################### -->
 <!-- # Account Active. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($user_password_2)}
 <P401>1</P401>
 {else}
@@ -912,7 +748,6 @@
 <!-- ############################################################### -->
 <!-- # DNS Mode. 0 - A Record, 1 - SRV, 2 - NAPTR/SRV, 3 - Use Configured IP. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($grandstream_dns_mode)}
 <P408>{$grandstream_dns_mode}</P408>
 {else}
@@ -920,7 +755,6 @@
 {/if}
 <!-- # DNS SRV Fail-over Mode. 0 - Default, 1 - Saved one until DNS TTL, 2 - Saved one until no response. Default is 0 -->
 <!-- # Number: 0,1,2 -->
-<!-- # Mandatory -->
 <P26140>0</P26140>
 
 <!-- # Primary IP. Maximum 15 characters -->
@@ -937,7 +771,6 @@
 
 <!-- # NAT Traversal. 0 - No, 1 - STUN, 2 - keep alive, 3 - UPnP, 4 - Auto, 5 - VPN. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3, 4, 5 -->
-<!-- # Mandatory -->
 {if isset($grandstream_nat_traversal)}
 <P414>{$grandstream_nat_traversal}</P414>
 {else}
@@ -953,74 +786,60 @@
 <!-- ############################################################### -->
 <!-- # TEL URI. 0 - Disabled, 1 - User=Phone, 2 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P409>0</P409>
 
 <!-- # SIP Registration. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P410>1</P410>
 
 <!-- # Unregister On Reboot. 0 - No, 1 - Yes, 2 - Instance. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P411>0</P411>
 
 <!-- # Register Expiration (in minutes). Default is 60. Max is 45 days -->
 <!-- # Number: 1 - 64800 -->
-<!-- # Mandatory -->
 <P412>{$register_expires_2}</P412>
 
 <!-- # Subscribe Expiration. Default is 60. Max about 45 days -->
 <!-- # Number: 1 - 64800 -->
-<!-- # Mandatory -->
 <P26151>60</P26151>
 
 <!-- # Reregister before Expiration (in seconds). Default is 0 -->
 <!-- # Number: 0 - 64800 -->
-<!-- # Mandatory -->
 <P2430>0</P2430>
 
 <!-- # Enable OPTIONS Keep Alive. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P2497>0</P2497>
 
 <!-- # OPTIONS Keep Alive Interval. Default is 30 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P2498>30</P2498>
 
 <!-- # OPTIONS Keep Alive Max Lost. Default is 3 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P2499>30</P2499>
 
 <!-- # Local SIP port. Default is 5062 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P413>5062</P413>
 
 <!-- # SIP Registration Failure Retry Wait Time (in seconds). Default is 20 -->
 <!-- # Number: 1 - 3600 -->
-<!-- # Mandatory -->
 <P471>20</P471>
 
 <!-- # SIP T1 Timeout. RFC 3261 T1 value (RTT estimate) -->
 <!-- # 50 - 0.5 sec, 100 - 1 sec, 200 - 2 sec. Default is 100 -->
 <!-- # Number: 50, 100, 200 -->
-<!-- # Mandatory -->
-<P440>50</P440>
+<P440>100</P440>
 
 <!-- # SIP T2 Timeout. RFC 3261 T2 value. The maximum retransmit interval for non-INVITE requests and INVITE responses -->
 <!-- # 200 - 2 sec, 400 - 4 sec, 800 - 8 sec. Default is 400 -->
 <!-- # Number: 200, 400, 800 -->
-<!-- # Mandatory -->
 <P441>400</P441>
 
 <!-- # SIP Transport. 0 - UDP, 1 - TCP, 2 - TCP/TLS. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 {$tp=0}
 {if $sip_transport_2 == 'udp'}{$tp=0}{/if}
 {if $sip_transport_2 == 'tcp'}{$tp=1}{/if}
@@ -1031,32 +850,26 @@
 <!-- # SIP Listening Mode.  -->
 <!-- # 0 - Transport Only, 1 - Dual, 2 - Dual (BLF Enforced), 3 - Dual (Secured). Default is 0 -->
 <!-- # Number: 0,1,2,3 -->
-<!-- # Mandatory -->
 <P26124>0</P26124>
 
 <!-- # SIP URI Scheme when using TLS. 0 - sip, 1 - sips. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2429>1</P2429>
 
 <!-- # Use Actual Ephemeral Port in Contact with TCP/TLS. 0 - No, 1- Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2431>0</P2431>
 
 <!-- # Outbound Proxy Mode. 0 - in route, 1 - not in route, 2 - always send to -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2405>0</P2405>
 
 <!-- # Support SIP Instance ID. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P489>1</P489>
 
 <!-- # SUBSCRIBE for MWI (Whether or not send SUBSCRIBE for Message Waiting Indication). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($subscribe_mwi)}
 <P415>1</P415>
 {else}
@@ -1065,40 +878,33 @@
 
 <!-- # SUBSCRIBE for Registration. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2419>0</P2419>
 
 <!-- # Enable 100rel. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P435>0</P435>
 
 <!-- # Caller ID Display. 0 - Auto, 1 - Disabled, 2 - From Header. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26125>0</P26125>
 
 <!-- # Callee ID Display. 0 - Auto, 1 - Disabled, 2 - From Header. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2424>0</P2424>
 
 <!-- # Add Auth Header On Initial REGISTER -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2459>0</P2459>
 
 <!-- #Allow SIP Reset -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- #Mandatory -->
 <P26115>0 </P26115>
 
 <!-- # Ignore Alert-Info header -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26118>0</P26118>
 
 <!-- ############################################################### -->
@@ -1108,37 +914,31 @@
 <!-- # Use Privacy Header -->
 <!-- # 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2438>0</P2438>
 
 <!-- # Use P-Preferred-Identity Header -->
 <!-- # 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2439>0</P2439>
 
 <!-- # Use X-Grandstream-PBX Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26154>1</P26154>
 
 <!-- # Use P-Access-Network-Info Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26158>1</P26158>
 
 <!-- # Use P-Emergency-Info Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26159>1</P26159>
 
 <!-- # Use MAC Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26161>1</P26161>
 
 <!-- ############################################################### -->
@@ -1146,7 +946,6 @@
 <!-- ############################################################### -->
 <!-- # Line-Seize Timeout (in seconds). Default is 15 -->
 <!-- # Number: 15 - 60 -->
-<!-- # Mandatory -->
 <P2413>15</P2413>
 
 <!-- # Eventlist BLF URI -->
@@ -1155,7 +954,6 @@
 
 <!-- #Auto Provision Eventlist BLFs. 0-Disabled, 1-Enabled. Default is 0 -->
 <!-- #Number:0,1 -->
-<!-- #Mandatory -->
 <P2489>0</P2489>
 
 <!-- # Conference URI -->
@@ -1168,12 +966,10 @@
 
 <!-- # Force BLF Call-pickup by prefix. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P6753>0</P6753>
 
 <!-- # BLF Call-pickup Prefix. Default is ** -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P481>**</P481>
 
 <!-- # Call Pickup Barge-In Code -->
@@ -1182,75 +978,37 @@
 
 <!-- # PUBLISH for Presence. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P488>0</P488>
 
 <!-- # Omit charset=UTF-8 in MESSAGE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2455>0</P2455>
 
 <!-- # Allow Unsolicited REFER. 0 - Disabled, 1 - Enabled, 2 - Enabled/Force Auth. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26123>0</P26123>
 
 <!-- # Special Feature. 100 - Standard, 101 - Nortel MCS, 102- Broadsoft, 108 - CBCOM, 109 - RNK, 110 - Sylantro, 117 - Huawei IMS -->
 <!-- # Number: 100, 101, 102, 108, 109, 110, 117. Default is 100 -->
-<!-- # Mandatory -->
 <P424>100</P424>
 
-<!-- # Broadsoft -->
-<!-- # Broadsoft Call Center. 0 - No, 1 - Yes. Default is 0 -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2441>0</P2441>
-
-<!-- # Hoteling Event. 0 - No, 1 - Yes. Default is 0 -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2442>0</P2442>
-
-<!-- # Call Center Status. 0 - No, 1 - Yes. Default is 0 -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2443>0</P2443>
-
-<!-- # Broadsoft Executive Assistant. 0 - Disabled, 1 - Enabled. Default is 0 -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2464>0</P2464>
-
-<!-- # Feature Key Synchronization. 0 - Disabled, 1 - Enabled. Default is 0. -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2425>0</P2425>
-
-<!-- # Broadsoft Call Park. 0 - Disabled, 1 - Enabled. Default is 0. -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P2488>0</P2488>
 <!-- ############################################################### -->
 <!-- # Account 2/SIP Settings/Session Timer -->
 <!-- ############################################################### -->
 <!-- # Enable Session Timer. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2495>1</P2495>
 
 <!-- # Session Expiration (in seconds). Default is 180 -->
 <!-- # Number: 90 - 64800 -->
-<!-- # Mandatory -->
 <P434>180</P434>
 
 <!-- # Minimum SE (in seconds). Default is 90. This value must be lower than or equal to P434 -->
 <!-- # Number: 90 - 64800 -->
-<!-- # Mandatory -->
 <P427>90</P427>
 
 <!-- # Caller Request Timer (Request for timer when calling). 0 - No, 1 - Yes -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P428>0</P428>
 
 <!-- # Callee Request Timer (Request for timer when called. i.e. if remote party supports timer but did not request for one) -->
@@ -1261,23 +1019,19 @@
 
 <!-- # Force Timer (Still use timer when remote party does not support timer). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P430>0	</P430>
 
 <!-- # UAC Specify Refresher. 0 - omit, 1 - UAC, 2 - UAS. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P432>0</P432>
 
 <!-- # UAS Specify Refresher. 1 - UAC, 2 - UAS. Default is 1 -->
 <!-- # Number: 1, 2 -->
-<!-- # Mandatory -->
 <P433>1</P433>
 
 <!-- # Force INVITE (Always refresh with INVITE instead of UPDATE even when remote party supports UPDATE) -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P431>0</P431>
 
 <!-- ############################################################### -->
@@ -1286,32 +1040,26 @@
 <!-- # Check Domain Certificates. 0 - No, 1 - Yes. When set to Yes/Enabled, the domain certificate will be checked as defined in RFC5922 -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2411>0</P2411>
 
 <!-- # Validate Certification Chain. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2467>0</P2467>
 
 <!-- # Validate Incoming Messages. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2406>0</P2406>
 
 <!-- # Check SIP User ID for incoming INVITE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P449>0</P449>
 
 <!-- # Accept Incoming SIP from Proxy Only. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2447>1</P2447>
 
 <!-- # Authenticate Incoming INVITE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2446>0</P2446>
 
 <!-- ############################################################### -->
@@ -1321,70 +1069,57 @@
 <!-- # 0 - PCMU, 2 - G.726-32, 8 - PCMA, 9 - G.722, 18 - G.729A/B, 4 - G.723.1, 98 - iLBC, 125 - OPUS -->
 <!-- # choice 1. Default is 0 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P451>0</P451>
 
 <!-- # choice 2. Default is 8 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P452>8</P452>
 
 <!-- # choice 3. Default is 4 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P453>4</P453>
 
 <!-- # choice 4. Default is 18 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P454>18</P454>
 
 <!-- # choice 5. Default is 9 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P455>9</P455>
 
 <!-- # choice 6. Default is 98 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P456>98</P456>
 
 <!-- # choice 7. Default is 2 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P457>2</P457>
 
 <!-- # choice 8. Default is 125 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P458>125</P458>
 
 <!-- # Use First Matching Vocoder in 200OK SDP. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2448>0</P2448>
 
 <!-- # Codec Negotiation Priority. 0 - Caller, 1 - Callee. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P29161>1</P29161>
 
 <!-- # Hide Vocoder. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P26147>0</P26147>
 
 <!-- #Disable Multiple m line in SDP -->
 <!-- #0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P487>0</P487>
 
 <!-- # SRTP Mode -->
 <!-- # 0 - Disabled, 1 - Enabled but not forced, 2 - Enabled and forced, 3 - Optional. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($grandstream_srtp)}
 <P443>{$grandstream_srtp}</P443>
 {else}
@@ -1394,89 +1129,72 @@
 <!-- # SRTP Key Length. 0 - AES 128&256 bit, 1 - AES 128 bit, 2 - AES 256 bit. Default is 0 -->
 <!-- # Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P2483>0</P2483>
 
 <!-- #Crypto Life Time -->
 <!-- #0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2463>0</P2463>
 
 <!-- # Symmetric RTP. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P460>0</P460>
 
 <!-- # Silence Suppression 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P485>0</P485>
 
 <!-- # Jitter Buffer Type. 0 - Fixed, 1 - Adaptive. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P498>1</P498>
 
 <!-- # Jitter Buffer Length.  -->
 <!-- # 0 - 100ms, 1 - 200ms, 2 - 300ms, 3 - 400ms, 4 - 500ms, 5 - 600ms, 6 - 700ms, 7 - 800ms. Default is 2 -->
 <!-- # Number: 0, 1, 2, 3, 4, 5, 6, 7 -->
-<!-- # Mandatory -->
 <P497>2</P497>
 
 <!-- # Voice Frames per TX (up to 10/20/32/64 frames for G711/G726/G723/other codecs respectively). Default is 2 -->
 <!-- # Number: 1 - 64 -->
-<!-- # Mandatory -->
 <P486>2</P486>
 
 <!-- # G723 Rate. 0 - 6.3kbps encoding rate, 1 - 5.3kbps encoding rate. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P493>1</P493>
 
 <!-- # G.726-32 Packing Mode. 0 - ITU, 1 - IETF. default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2423>0</P2423>
 
 <!-- # iLBC Frame Size. 0 - 20ms, 1 - 30ms. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P495>1</P495>
 
 <!-- # iLBC Payload Type. Default is 97 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P494>97</P494>
 
 <!-- # OPUS Payload Type. Default is 123 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P2485>123</P2485>
 
 <!-- # DTMF Payload Type. Default is 101 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P496>101</P496>
 
 <!-- # Send DTMF: In-audio. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2401>0</P2401>
 
 <!-- # Send DTMF: Via RTP (RFC2833). 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2402>1</P2402>
 
 <!-- # Send DTMF: Via SIP INFO. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2403>0</P2403>
 
 <!-- # DTMF Delay. Default is 250 -->
 <!-- # Number: 100 - 250  -->
-<!-- # Mandatory -->
 <P26160>250</P26160>
 
 <!-- ############################################################### -->
@@ -1484,7 +1202,6 @@
 <!-- ############################################################### -->
 <!-- # Early Dial (use "Yes" only if proxy supports 484 response). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P422>0</P422>
 
 <!-- # Dial Plan Prefix -->
@@ -1493,107 +1210,91 @@
 
 <!-- # Dial Plan. Default is { x+ | \+x+ | *x+ | *xx*x+ } -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P459>{$grandstream_dial_plan}</P459>
 
 <!-- # Call Log. 0 - Log All Calls, 1 - Log Incoming/Outgoing only (missed calls NOT recorded), 2 - Disable Call Log. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
-<P442>0</P442>
+<!-- <P442>0</P442> -->
 
 <!-- # Account Ring Tone. 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone, 4 - silent. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory  -->
-<P423>0</P423>
+{if isset($grandstream_default_ringtone)
+<P423>{$grandstream_default_ringtone}</P423>
+{/if}
 
 <!-- # Matching Incoming Caller ID. Matching Rule 1 -->
 <!-- # String -->
-<P1494></P1494>
+<P1494>ring1</P1494>
 
 <!-- # Matching Rule 1 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
-<P1495>0</P1495>
+<P1495>1</P1495>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 2. -->
 <!-- # String -->
-<P1496></P1496>
+<P1496>ring2</P1496>
 
 <!-- # Matching Rule 2 Distinctive Ringtone. -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
-<P1497>0</P1497>
+<P1497>2</P1497>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 3. -->
 <!-- # String -->
-<P1498></P1498>
+<P1498>ring3</P1498>
 
 <!-- # Matching Rule 3 Distinctive Ringtone. -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
-<P1499>0</P1499>
+<P1499>3</P1499>
 
 <!-- # Ring Timeout (in seconds) Default is 60 -->
 <!-- # Number: 30 - 3600 -->
-<!-- # Mandatory -->
 <P476>60</P476>
 
 <!-- # Send Anonymous (caller ID will be blocked if set to Yes). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P421>0</P421>
 
 <!-- # Anonymous Call Rejection. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P446>0</P446>
 
 <!-- # Auto Answer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P425>0</P425>
 
 <!-- # Refer-To Use Target Contact. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P469>0</P469>
 
 <!-- # Transfer on conference HangUp. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2404>0</P2404>
 
 <!-- # Disable Recovery on Blind Transfer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2484>0</P2484>
 
 <!-- # Blind Transfer Wait Timeout. Default is 30 -->
 <!-- # Number: 30 - 300 -->
-<!-- # Mandatory -->
 <P26170>30</P26170>
 
 <!-- # No Key Entry Timeout. Default is 4 -->
 <!-- # Number: 1 - 15 -->
-<!-- # Mandatory -->
 <P491>4</P491>
 
 <!-- # Use # As Dial Key. 0 - No, 1 - Yes -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P492>1</P492>
 
 <!-- #On Hold Reminder Tone. 0 - Disabled, 1 - Enable. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26106>0</P26106>
 
 <!-- # RFC2543 Hold. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26162>1</P26162>
 
 <!-- # Hiding Dialing Password -->
@@ -1603,35 +1304,30 @@
 
 <!-- # Password length. Default is 0 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P26150>0</P26150>
 
 <!-- # Disable Call Waiting. 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
-<P26163>0</P26163>
+<P26163>{$grandstream_call_waiting}</P26163>
 
 <!-- ############################################################### -->
 <!-- # Account 2/Intercom Settings -->
 <!-- ############################################################### -->
 <!-- # Allow Auto Answer by Call-Info/Alert-Info. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P438>0</P438>
+<!-- Required set to 1 for Fusion intercom to work -->
+<P438>1</P438>
 
 <!-- # Allow Barging by Call-Info/Alert-Info. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26119>0</P26119>
 
 <!-- # Mute on answer Intercom call. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26171>0</P26171>
 
 <!-- # Play warning tone for Auto Answer Intercom. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26172>0</P26172>
 
 <!-- # Custom Call-Info for Auto Answer. -->
@@ -1643,45 +1339,8 @@
 <!-- ############################################################### -->
 <!-- #Enable Call Features.  0 - No, 1 - Yes. Default is 1 -->
 <!-- #Number: 0, 1  -->
-<!-- #Mandatory -->
-<P420>1</P420>
-
-<!-- #Do Not Disturb (DND) - On -->
-<!-- # String -->
-<P2444></P2444>
-
-<!-- #Do Not Disturb (DND) - Off -->
-<!-- # String -->
-<P2445></P2445>
-
-<!-- #Call Forward Unconditionally (All) - On -->
-<!-- # String -->
-<P26113></P26113>
-
-<!-- #Call Forward Unconditionally (All) - Off -->
-<!-- # String -->
-<P26114></P26114>
-
-<!-- #Call Forward Busy - On -->
-<!-- # String -->
-<P26109></P26109>
-
-<!-- #Call Forward Busy - Off -->
-<!-- # String -->
-<P26110></P26110>
-
-<!-- #Call Forward Delayed (No Answer) - On -->
-<!-- #String -->
-<P26111></P26111>
-
-<!-- #Call Forward Delayed (No Answer) - Off -->
-<!-- #String -->
-<P26112></P26112>
-
-<!-- #Delayed Call Forward Wait Time (in seconds). Default is 20 -->
-<!-- #Number: 1 - 120 -->
-<!-- #Mandatory -->
-<P470></P470>
+<!-- MUST be DISABLED (0) for Fusion features to work -->
+<P420>0</P420>
 
 <!-- #################################################################### -->
 <!-- # Account 3 -->
@@ -1691,7 +1350,6 @@
 <!-- ############################################################### -->
 <!-- # Account Active. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($user_password_3)}
 <P501>1</P501>
 {else}
@@ -1748,7 +1406,6 @@
 <!-- ############################################################### -->
 <!-- # DNS Mode. 0 - A Record, 1 - SRV, 2 - NAPTR/SRV, 3 - Use Configured IP. Default is 0  -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($grandstream_dns_mode)}
 <P508>{$grandstream_dns_mode}</P508>
 {else}
@@ -1757,7 +1414,6 @@
 
 <!-- # DNS SRV Fail-over Mode. 0 - Default, 1 - Saved one until DNS TTL, 2 - Saved one until no response. Default is 0 -->
 <!-- # Number: 0,1,2 -->
-<!-- # Mandatory -->
 <P26240>0</P26240>
 
 <!-- # Primary IP. Maximum 15 characters -->
@@ -1774,7 +1430,6 @@
 
 <!-- # NAT Traversal. 0 - No, 1 - STUN, 2 - keep alive, 3 - UPnP, 4 - Auto, 5 - VPN. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3, 4, 5 -->
-<!-- # Mandatory -->
 {if isset($grandstream_nat_traversal)}
 <P514>{$grandstream_nat_traversal}</P514>
 {else}
@@ -1790,74 +1445,60 @@
 <!-- ############################################################### -->
 <!-- # TEL URI. 0 - Disabled, 1 - User=Phone, 2 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P509>0</P509>
 
 <!-- # SIP Registration. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P510>1</P510>
 
 <!-- # Unregister On Reboot. 0 - No, 1 - Yes, 2 - Instance. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P511>0</P511>
 
 <!-- # Register Expiration (in minutes). Default is 60. Max is 45 days -->
 <!-- # Number: 1 - 64800 -->
-<!-- # Mandatory -->
 <P512>{$register_expires_3}</P512>
 
 <!-- # Subscribe Expiration. Default is 60. Max about 45 days -->
 <!-- # Number: 1 - 64800 -->
-<!-- # Mandatory -->
 <P26251>60</P26251>
 
 <!-- # Reregister before Expiration (in seconds). Default is 0 second -->
 <!-- # Number: 0 - 64800 -->
-<!-- # Mandatory -->
 <P2530>0</P2530>
 
 <!-- # Enable OPTIONS Keep Alive. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P2597>0</P2597>
 
 <!-- # OPTIONS Keep Alive Interval. Default is 30 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P2598>30</P2598>
 
 <!-- # OPTIONS Keep Alive Max Lost. Default is 3 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P2599>30</P2599>
 
 <!-- # Local SIP Port. Default is 5064 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P513>5064</P513>
 
 <!-- # SIP Registration Failure Retry Wait Time (in seconds). Default is 20 -->
 <!-- # Number: 1 - 3600 -->
-<!-- # Mandatory -->
 <P571>20</P571>
 
 <!-- # SIP T1 Timeout. RFC 3261 T1 value (RTT estimate) -->
 <!-- # 50 - 0.5 sec, 100 - 1 sec, 200 - 2 sec. Default is 100 -->
 <!-- # Number: 50, 100, 200 -->
-<!-- # Mandatory -->
 <P540>50</P540>
 
 <!-- # SIP T2 Timeout. RFC 3261 T2 value. The maximum retransmit interval for non-INVITE requests and INVITE responses. -->
 <!-- # 200 - 2 sec, 400 - 4 sec, 800 - 8 sec. Default is 400 -->
 <!-- # Number: 200, 400, 800 -->
-<!-- # Mandatory -->
 <P541>400</P541>
 
 <!-- # SIP Transport. 0 - UDP, 1 - TCP. 2- TCP/TLS. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 {$tp=0}
 {if $sip_transport_3 == 'udp'}{$tp=0}{/if}
 {if $sip_transport_3 == 'tcp'}{$tp=1}{/if}
@@ -1868,32 +1509,26 @@
 <!-- # SIP Listening Mode.  -->
 <!-- # 0 - Transport Only, 1 - Dual, 2 - Dual (BLF Enforced), 3 - Dual (Secured). Default is 0 -->
 <!-- # Number: 0,1,2,3 -->
-<!-- # Mandatory -->
 <P26224>0</P26224>
 
 <!-- # SIP URI Scheme When Using TLS. 0 - sip, 1 - sips. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2529>1</P2529>
 
 <!-- # Use Actual Ephemeral Port in Contact with TCP/TLS. 0 - No, 1- Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2531>0</P2531>
 
 <!-- # Outbound Proxy Mode. 0 - in route, 1 - not in route, 2 - always send to -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2505>0</P2505>
 
 <!-- # Support SIP Instace ID. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P589>1</P589>
 
 <!-- # SUBSCRIBE for MWI (Whether or not send SUBSCRIBE for Message Waiting Indication). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($subscribe_mwi)}
 <P515>1</P515>
 {else}
@@ -1902,40 +1537,33 @@
 
 <!-- # SUBSCRIBE for Registration. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2519>0</P2519>
 
 <!-- # Enable 100rel. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P535>0</P535>
 
 <!-- # Callee ID Display. 0 - Auto, 1 - Disabled, 2 - From Header. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26225>0</P26225>
 
 <!-- # Caller ID Display. 0 - Auto, 1 - Disabled, 2 - From Header. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2524>0</P2524>
 
 <!-- # Add Auth Header On Initial REGISTER -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2559>0</P2559>
 
 <!-- #Allow SIP Reset -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- #Mandatory -->
 <P26215>0</P26215>
 
 <!-- # Ignore Alert-Info header -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26218>0</P26218>
 
 <!-- ############################################################### -->
@@ -1945,37 +1573,31 @@
 <!-- # Use Privacy Header -->
 <!-- # 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2538>0</P2538>
 
 <!-- # Use P-Preferred-Identity Header -->
 <!-- # 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2539>0</P2539>
 
 <!-- # Use X-Grandstream-PBX Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26254>1</P26254>
 
 <!-- # Use P-Access-Network-Info Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26258>1</P26258>
 
 <!-- # Use P-Emergency-Info Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26259>1</P26259>
 
 <!-- # Use MAC Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26261>1</P26261>
 
 <!-- ########################################## -->
@@ -1983,7 +1605,6 @@
 <!-- ########################################## -->
 <!-- # Line-Seize Timeout (in seconds). Default is 15 -->
 <!-- # Number: 15 - 60 -->
-<!-- # Mandatory -->
 <P2513>15</P2513>
 
 <!-- # Eventlist BLF URI -->
@@ -1992,7 +1613,6 @@
 
 <!-- #Auto Provision Eventlist BLFs. 0-Disabled, 1-Enabled. Default is 0 -->
 <!-- #Number:0,1 -->
-<!-- #Mandatory -->
 <P2589>0</P2589>
 
 <!-- # Conference URI -->
@@ -2005,12 +1625,10 @@
 
 <!-- # Force BLF Call-pickup by prefix. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P6754>0</P6754>
 
 <!-- # BLF Call-pickup Prefix. Default is ** -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P581>**</P581>
 
 <!-- # Call Pickup Barge-In Code -->
@@ -2019,53 +1637,43 @@
 
 <!-- # PUBLISH for Presence. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P588>0</P588>
 
 <!-- # Omit charset=UTF-8 in MESSAGE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2555>0</P2555>
 
 <!-- # Allow Unsolicited REFER. 0 - Disabled, 1 - Enabled, 2 - Enabled/Force Auth. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26223>0</P26223>
 
 <!-- # Special Feature. 100 - Standard, 101 - Nortel MCS, 102- Broadsoft, 108 - CBCOM, 109 - RNK, 110 - Sylantro, 117 - Huawei IMS. Default is 100 -->
 <!-- # Number: 100, 101, 102, 108, 109, 110, 117 -->
-<!-- # Mandatory -->
 <P524>100</P524>
 
 <!-- # Broadsoft -->
 <!-- # Broadsoft Call Center. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2541>0</P2541>
 
 <!-- # Hoteling Event. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2542>0</P2542>
 
 <!-- # Call Center Status. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2543>0</P2543>
 
 <!-- # Broadsoft Executive Assistant. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2564>0</P2564>
 
 <!-- # Feature Key Synchronization. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2525>0</P2525>
 
 <!-- # Broadsoft Call Park. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2588>0</P2588>
 
 <!-- ########################################## -->
@@ -2073,48 +1681,39 @@
 <!-- ########################################## -->
 <!-- # Enable Session Timer. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2595>1</P2595>
 
 <!-- # Session Expiration (in seconds). Default is 180 -->
 <!-- # Number: 90 - 64800 -->
-<!-- # Mandatory -->
 <P534>180</P534>
 
 <!-- # Minimum SE (in seconds). Default is 90. This value must be lower than or equal to P534 -->
 <!-- # Number: 90 - 64800 -->
-<!-- # Mandatory -->
 <P527>90</P527>
 
 <!-- # Caller Request Timer (Request for timer when calling) 0 - No, 1 - Yes -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P528>0</P528>
 
 <!-- # Callee Request Timer (Request for timer when called. i.e. if remote party supports timer but did not request for one) -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P529>0</P529>
 
 <!-- # Force Timer (Still use timer when remote party does not support timer). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P530>0</P530>
 
 <!-- # UAC Specify Refresher. 0 - omit, 1 - UAC, 2 - UAS. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P532>0</P532>
 
 <!-- # UAS Specify Refresher. 1 - UAC, 2 - UAS. Default is 1 -->
 <!-- # Number: 1, 2 -->
-<!-- # Mandatory -->
 <P533>1</P533>
 
 <!-- # Force INVITE (Always refresh with INVITE instead of UPDATE even when remote party supports UPDATE). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P531>0</P531>
 
 <!-- ########################################## -->
@@ -2123,32 +1722,26 @@
 <!-- # Check Domain Certificates. When set to Yes/Enabled, the domain certificate will be checked as defined in RFC5922 -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2511>0</P2511>
 
 <!-- # Validate Certification Chain. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2567>0</P2567>
 
 <!-- # Validate Incoming Messages. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2506>0</P2506>
 
 <!-- # Check SIP User ID for incoming INVITE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P549>0</P549>
 
 <!-- # Accept Incoming SIP from Proxy Only. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2547>1</P2547>
 
 <!-- # Authenticate Incoming INVITE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2546>0</P2546>
 
 <!-- ########################################## -->
@@ -2156,91 +1749,74 @@
 <!-- ########################################## -->
 <!-- # Send DTMF: In-audio. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2501>0</P2501>
 
 <!-- # Send DTMF: Via RTP (RFC2833). 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2502>1</P2502>
 
 <!-- # Send DTMF: Via SIP INFO. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2503>0</P2503>
 
 <!-- # OPUS Payload Type. Default is 123 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P2585>123</P2585>
 
 <!-- # DTMF Payload Type. Default is 101 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P596>101</P596>
 
 <!-- # Preferred Vocoder -->
 <!-- # 0 - PCMU, 2 - G.726-32, 8 - PCMA, 9 - G.722, 18 - G.729A/B, 4 - G.723.1, 98 - iLBC, 125 - OPUS -->
 <!-- # choice 1. Default is 0 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P551>0</P551>
 
 <!-- # choice 2. Default is 8 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P552>8</P552>
 
 <!-- # choice 3. Default is 4 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P553>4</P553>
 
 <!-- # choice 4. Default is 18 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P554>18</P554>
 
 <!-- # choice 5. Default is 9 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P555>9</P555>
 
 <!-- # choice 6. Default is 98 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P556>98</P556>
 
 <!-- # choice 7. Default is 2 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P557>2</P557>
 
 <!-- # choice 8. Default is 125 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P558>125</P558>
 
 <!-- # Use First Matching Vocoder in 200OK SDP. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2548>0</P2548>
 
 <!-- # Codec Negotiation Priority. 0 - Caller, 1 - Callee. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P29261>1</P29261>
 
 <!-- # Disable Multiple m line in SDP -->
 <!-- #0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P587>0</P587>
 
 <!-- # SRTP Mode -->
 <!-- # 0 - Disabled, 1 - Enabled but not forced, 2 - Enabled and forced, 3 - Optional. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($grandstream_srtp)}
 <P543>{$grandstream_srtp}</P543>
 {else}
@@ -2250,69 +1826,56 @@
 <!-- # SRTP Key Length. 0 - AES 128&256 bit, 1 - AES 128 bit, 2 - AES 256 bit. Default is 0 -->
 <!-- # Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P2583>0</P2583>
 
 <!-- #Crypto Life Time -->
 <!-- #0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2563>0</P2563>
 
 <!-- # Symmetric RTP. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P560>0</P560>
 
 <!-- # Silence Suppression 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P585>0</P585>
 
 <!-- # Voice Frames per TX (up to 10/20/32/64 frames for G711/G726/G723/other codecs respectively). Default is 2 -->
 <!-- # Number: 1 - 64 -->
-<!-- # Mandatory -->
 <P586>2</P586>
 
 <!-- # G723 Rate. 0 - 6.3kbps encoding rate, 1 - 5.3kbps encoding rate. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P593>1</P593>
 
 <!-- # G.726-32 Packing Mode. 0 - ITU, 1 - IETF. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2523>0</P2523>
 
 <!-- # iLBC Frame Size. 0 - 20ms, 1 - 30ms. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P595>1</P595>
 
 <!-- # iLBC Payload Type. Default is 97 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P594>97</P594>
 
 <!-- # Jitter Buffer Type. 0 - Fixed, 1 - Adaptive. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P598>1</P598>
 
 <!-- # Jitter Buffer Length. 0 - 100ms, 1 - 200ms, 2 - 300ms, 3 - 400ms, 4 - 500ms, 5 - 600ms, 6 - 700ms, 7 - 800ms. Default is 2 -->
 <!-- # Number: 0, 1, 2, 3, 4, 5, 6, 7 -->
-<!-- # Mandatory -->
 <P597>2</P597>
 
 <!-- # Hide Vocoder. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P26247>0</P26247>
 
 <!-- # DTMF Delay. Default is 250 -->
 <!-- # Number: 100 - 250  -->
-<!-- # Mandatory -->
 <P26260>250</P26260>
 
 <!-- ########################################## -->
@@ -2320,7 +1883,6 @@
 <!-- ########################################## -->
 <!-- # Early Dial (use "Yes" only if proxy supports 484 response). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P522>0</P522>
 
 <!-- # Dial Plan Prefix -->
@@ -2329,17 +1891,14 @@
 
 <!-- # Dial Plan. Default is { x+ | \+x+ | *x+ | *xx*x+ } -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P559>{$grandstream_dial_plan}</P559>
 
 <!-- # Call Log. 0 - Log All Calls, 1 - Log Incoming/Outgoing only (Missed calls NOT recorded), 2 - Disable Call Log. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P542>0</P542>
 
 <!-- # Account Ring Tone. 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone, 4 - silent. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P523>0</P523>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 1 -->
@@ -2349,7 +1908,6 @@
 <!-- # Matching Rule 1 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1501>0</P1501>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 2 -->
@@ -2359,7 +1917,6 @@
 <!-- # Matching Rule 2 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1503>0</P1503>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 3 -->
@@ -2369,67 +1926,54 @@
 <!-- # Matching Rule 3 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1505>0</P1505>
 
 <!-- # Ring Timeout (in seconds). Default is 60 -->
 <!-- # Number: 30 - 3600 -->
-<!-- # Mandatory -->
 <P576>60</P576>
 
 <!-- # Send Anonymous (caller ID will be blocked if set to Yes). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P521>0</P521>
 
 <!-- # Anonymous Call Rejection. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P546>0</P546>
 
 <!-- # Auto Answer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P525>0</P525>
 
 <!-- # Refer-To Use Target Contact. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P569>0</P569>
 
 <!-- # Transfer on conference Hang-Up. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2504>0</P2504>
 
 <!-- #Disable Recovery on Blind Transfer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2584>0</P2584>
 
 <!-- # Blind Transfer Wait Timeout. Default is 30 -->
 <!-- # Number: 30 - 300 -->
-<!-- # Mandatory -->
 <P26270>30</P26270>
 
 <!-- # No Key Entry Timeout. Default is 4 -->
 <!-- # Number: 1 - 15 -->
-<!-- # Mandatory -->
 <P591>4</P591>
 
 <!-- # Use # As Dial Key. 0 - No, 1 - Yes -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P592>1</P592>
 
 <!-- #On Hold Reminder Tone. 0 - Disabled, 1 - Enable. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26206>0</P26206>
 
 <!-- # RFC2543 Hold. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26262>1</P26262>
 
 <!-- # Hiding Dialing Password -->
@@ -2439,35 +1983,29 @@
 
 <!-- # Password length. Default is 0 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P26250>0</P26250>
 
 <!-- # Disable Call Waiting. 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
-<P26263>0</P26263>
+<P26263>{$grandstream_call_waiting}</P26263>
 
 <!-- ############################################################### -->
 <!-- # Account 3/Intercom Settings -->
 <!-- ############################################################### -->
 <!-- # Allow Auto Answer by Call-Info/Alert-Info. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P538>0</P538>
 
 <!-- # Allow Barging by Call-Info/Alert-Info. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26219>0</P26219>
 
 <!-- # Mute on answer Intercom call. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26271>0</P26271>
 
 <!-- # Play warning tone for Auto Answer Intercom. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26272>0</P26272>
 
 <!-- # Custom Call-Info for Auto Answer. -->
@@ -2480,7 +2018,6 @@
 <!-- ########################################## -->
 <!-- #Enable Call Features.  0 - No, 1 - Yes. Default is 1 -->
 <!-- #Number: 0, 1  -->
-<!-- #Mandatory -->
 <P520>1</P520>
 
 <!-- #Do Not Disturb (DND) - On -->
@@ -2517,7 +2054,6 @@
 
 <!-- #Delayed Call Forward Wait Time (in seconds). Default is 20 -->
 <!-- #Number: 1 - 120 -->
-<!-- #Mandatory -->
 <P570></P570>
 
 <!-- #################################################################### -->
@@ -2528,7 +2064,6 @@
 <!-- ########################################## -->
 <!-- # Account Active. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($user_password_4)}
 <P601>1</P601>
 {else}
@@ -2584,7 +2119,6 @@
 <!-- ########################################## -->
 <!-- # DNS Mode. 0 - A Record, 1 - SRV, 2 - NAPTR/SRV, 3 - Use Configured IP. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($grandstream_dns_mode)}
 <P608>{$grandstream_dns_mode}</P608>
 {else}
@@ -2593,7 +2127,6 @@
 
 <!-- # DNS SRV Fail-over Mode. 0 - Default, 1 - Saved one until DNS TTL, 2 - Saved one until no response. Default is 0 -->
 <!-- # Number: 0,1,2 -->
-<!-- # Mandatory -->
 <P26340>0</P26340>
 
 <!-- # Primary IP. Maximum 15 characters -->
@@ -2610,7 +2143,6 @@
 
 <!-- # NAT Traversal. 0 - No, 1 - STUN, 2 - keep alive, 3 - UPnP, 4 - Auto, 5 - VPN. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3, 4, 5 -->
-<!-- # Mandatory -->
 {if isset($grandstream_nat_traversal)}
 <P614>{$grandstream_nat_traversal}</P614>
 {else}
@@ -2626,74 +2158,60 @@
 <!-- ########################################## -->
 <!-- # TEL URI. 0 - Disabled, 1 - User=Phone, 2 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P609>0</P609>
 
 <!-- # SIP Registration. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P610>1</P610>
 
 <!-- # Unregister On Reboot. 0 - No, 1 - Yes, 2 - Instance. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P611>0</P611>
 
 <!-- # Register Expiration (in minutes). Default is 60. Max is 45 days -->
 <!-- # Number: 1 - 64800 -->
-<!-- # Mandatory -->
 <P612>{$register_expires_4}</P612>
 
 <!-- # Subscribe Expiration. Default is 60. Max about 45 days -->
 <!-- # Number: 1 - 64800 -->
-<!-- # Mandatory -->
 <P26351>60</P26351>
 
 <!-- # Reregister before Expiration (in seconds). Default is 0 -->
 <!-- # Number: 0 - 64800 -->
-<!-- # Mandatory -->
 <P2630>0</P2630>
 
 <!-- # Enable OPTIONS Keep Alive. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P2697>0</P2697>
 
 <!-- # OPTIONS Keep Alive Interval. Default is 30 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P2698>30</P2698>
 
 <!-- # OPTIONS Keep Alive Max Lost. Default is 3 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P2699>30</P2699>
 
 <!-- # Local SIP port. Default is 5066 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P613>5066</P613>
 
 <!-- # SIP Registration Failure Retry Wait Time (in seconds). Default is 20 -->
 <!-- # Number: 1 - 3600 -->
-<!-- # Mandatory -->
 <P671>20</P671>
 
 <!-- # SIP T1 Timeout. RFC 3261 T1 value (RTT estimate) -->
 <!-- # 50 - 0.5 sec, 100 - 1 sec, 200 - 2 sec. Default is 100 -->
 <!-- # Number: 50, 100, 200 -->
-<!-- # Mandatory -->
 <P640>50</P640>
 
 <!-- # SIP T2 Timeout. RFC 3261 T2 value. The maximum retransmit interval for non-INVITE requests and INVITE responses -->
 <!-- # 200 - 2 sec, 400 - 4 sec, 800 - 8 sec. Default is 400 -->
 <!-- # Number: 200, 400, 800 -->
-<!-- # Mandatory -->
 <P641>400</P641>
 
 <!-- # SIP Transport. 0 - UDP, 1 - TCP. 2 - TCP/TLS. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 {$tp=0}
 {if $sip_transport_4 == 'udp'}{$tp=0}{/if}
 {if $sip_transport_4 == 'tcp'}{$tp=1}{/if}
@@ -2704,32 +2222,26 @@
 <!-- # SIP Listening Mode.  -->
 <!-- # 0 - Transport Only, 1 - Dual, 2 - Dual (BLF Enforced), 3 - Dual (Secured). Default is 0 -->
 <!-- # Number: 0,1,2,3 -->
-<!-- # Mandatory -->
 <P26324>0</P26324>
 
 <!-- # SIP URI Scheme When Using TLS. 0 - sip, 1 - sips. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2629>1</P2629>
 
 <!-- # Use Actual Ephemeral Port in Contact with TCP/TLS. 0 - No, 1- Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2631>0</P2631>
 
 <!-- # Outbound Proxy Mode. 0 - in route, 1 - not in route, 2 - always send to -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2605>0</P2605>
 
 <!-- # Support SIP Instance ID. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P689>1</P689>
 
 <!-- # SUBSCRIBE for MWI (Whether or not send SUBSCRIBE for Message Waiting Indication). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($subscribe_mwi)}
 <P615>1</P615>
 {else}
@@ -2738,40 +2250,33 @@
 
 <!-- # SUBSCRIBE for Registration. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2619>0</P2619>
 
 <!-- # Enable 100rel. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P635>0</P635>
 
 <!-- # Callee ID Display. 0 - Auto, 1 - Disabled, 2 - From Header. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26325>0</P26325>
 
 <!-- # Caller ID Display. 0 - Auto, 1 - Disabled, 2 - From Header. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2624>0</P2624>
 
 <!-- # Add Auth Header On Initial REGISTER -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2659>0</P2659>
 
 <!-- #Allow SIP Reset -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- #Mandatory -->
 <P26315>0</P26315>
 
 <!-- # Ignore Alert-Info header -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26318>0</P26318>
 
 <!-- ############################################################### -->
@@ -2781,37 +2286,31 @@
 <!-- # Use Privacy Header -->
 <!-- # 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2638>0</P2638>
 
 <!-- # Use P-Preferred-Identity Header -->
 <!-- # 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2639>0</P2639>
 
 <!-- # Use X-Grandstream-PBX Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26354>1</P26354>
 
 <!-- # Use P-Access-Network-Info Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26358>1</P26358>
 
 <!-- # Use P-Emergency-Info Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26359>1</P26359>
 
 <!-- # Use MAC Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26361>1</P26361>
 
 <!-- ########################################## -->
@@ -2819,7 +2318,6 @@
 <!-- ########################################## -->
 <!-- # Line-Seize Timeout (in seconds). Default is 15 -->
 <!-- # Number: 15 - 60 -->
-<!-- # Mandatory -->
 <P2613>15</P2613>
 
 <!-- # Eventlist BLF URI -->
@@ -2828,7 +2326,6 @@
 
 <!-- #Auto Provision Eventlist BLFs. 0-Disabled, 1-Enabled. Default is 0 -->
 <!-- #Number:0,1 -->
-<!-- #Mandatory -->
 <P2689>0</P2689>
 
 <!-- # Conference URI -->
@@ -2841,12 +2338,10 @@
 
 <!-- # Force BLF Call-pickup by prefix. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P6755>0</P6755>
 
 <!-- # BLF Call-pickup Prefix. Default is ** -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P681>**</P681>
 
 <!-- # Call Pickup Barge-In Code -->
@@ -2855,53 +2350,43 @@
 
 <!-- # PUBLISH for Presence. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P688>0</P688>
 
 <!-- # Omit charset=UTF-8 in MESSAGE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2655>0</P2655>
 
 <!-- # Allow Unsolicited REFER. 0 - Disabled, 1 - Enabled, 2 - Enabled/Force Auth. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26323>0</P26323>
 
 <!-- # Special Feature. 100 - Standard, 101 - Nortel MCS, 102- Broadsoft, 108 - CBCOM, 109 - RNK, 110 - Sylantro, 117 - Huawei IMS. Default is 100 -->
 <!-- # Number: 100, 101, 102, 108, 109, 110, 117 -->
-<!-- # Mandatory -->
 <P624>100</P624>
 
 <!-- # Broadsoft -->
 <!-- # Broadsoft Call Center. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2641>0</P2641>
 
 <!-- # Hoteling Event. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2642>0</P2642>
 
 <!-- # Call Center Status. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2643>0</P2643>
 
 <!-- # Broadsoft Executive Assistant. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2664>0</P2664>
 
 <!-- # Feature Key Synchronization. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2625>0</P2625>
 
 <!-- # Broadsoft Call Park. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2688>0</P2688>
 
 <!-- ########################################## -->
@@ -2909,49 +2394,40 @@
 <!-- ########################################## -->
 <!-- # Enable Session Timer. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2695>1</P2695>
 
 <!-- # Session Expiration (in seconds). Default is 180 -->
 <!-- # Number: 90 - 64800 -->
-<!-- # Mandatory -->
 <P634>180</P634>
 
 <!-- # Minimum SE (in seconds). Default is 90 seconds. This value must be lower than or equal to P634 -->
 <!-- # Number: 90 - 64800 -->
-<!-- # Mandatory -->
 <P627>90</P627>
 
 <!-- # Caller Request Timer (Request for timer when calling). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P628>0</P628>
 
 <!-- # Callee Request Timer (Request for timer when called. i.e. if remote party supports timer but did not request for one) -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P629>0</P629>
 
 <!-- # Force Timer (Still use timer when remote party does not support timer). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P630>0</P630>
 
 <!-- # UAC Specify Refresher. 0 - omit, 1 - UAC, 2 - UAS. Default is 0 -->
 <!-- # Number: 0 - 2 -->
-<!-- # Mandatory -->
 <P632>0</P632>
 
 <!-- # UAS Specify Refresher. 1 - UAC, 2 - UAS. Default is 1 -->
 <!-- # Number: 1, 2 -->
-<!-- # Mandatory -->
 <P633>1</P633>
 
 <!-- # Force INVITE (Always refresh with INVITE instead of UPDATE even when remote party supports UPDATE). -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P631>0</P631>
 
 <!-- ########################################## -->
@@ -2960,32 +2436,26 @@
 <!-- # Check Domain Certificates. When set to Yes/Enabled, the domain certificate will be checked as defined in RFC5922 -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2611>0</P2611>
 
 <!-- # Validate Certification Chain. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2667>0</P2667>
 
 <!-- # Validate Incoming Messages. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2606>0</P2606>
 
 <!-- # Check SIP User ID for incoming INVITE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P649>0</P649>
 
 <!-- # Accept Incoming SIP from Proxy Only. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2647>1</P2647>
 
 <!-- # Authenticate Incoming INVITE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2646>0</P2646>
 
 <!-- ########################################## -->
@@ -2993,91 +2463,74 @@
 <!-- ########################################## -->
 <!-- # Send DTMF: In-audio. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2601>0</P2601>
 
 <!-- # Send DTMF: Via RTP (RFC2833). 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2602>1</P2602>
 
 <!-- # Send DTMF: Via SIP INFO. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2603>0</P2603>
 
 <!-- # OPUS Payload Type. Default is 123 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P2685>123</P2685>
 
 <!-- # DTMF Payload Type. Default is 101 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P696>101</P696>
 
 <!-- # Preferred Vocoder -->
 <!-- # 0 - PCMU, 2 - G.726-32, 8 - PCMA, 9 - G.722, 18 - G.729A/B, 4 - G.723.1, 98 - iLBC, 125 - OPUS -->
 <!-- # choice 1. Default is 0 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P651>0</P651>
 
 <!-- # choice 2. Default is 8 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P652>8</P652>
 
 <!-- # choice 3. Default is 4 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P653>4</P653>
 
 <!-- # choice 4. Default is 18 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P654>18</P654>
 
 <!-- # choice 5. Default is 9 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P655>9</P655>
 
 <!-- # choice 6. Default is 98 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P656>98</P656>
 
 <!-- # choice 7. Default is 2 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P657>2</P657>
 
 <!-- # choice 8. Default is 125 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P658>125</P658>
 
 <!-- # Use First Matching Vocoder in 200OK SDP. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2648>0</P2648>
 
 <!-- # Codec Negotiation Priority. 0 - Caller, 1 - Callee. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P29361>1</P29361>
 
 <!-- #Disable Multiple m line in SDP -->
 <!-- #0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P687>0</P687>
 
 <!-- # SRTP Mode -->
 <!-- # 0 - Disabled, 1 - Enabled but not forced, 2 - Enabled and forced, 3 - Optional. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($grandstream_srtp)}
 <P643>{$grandstream_srtp}</P643>
 {else}
@@ -3087,70 +2540,57 @@
 <!-- # SRTP Key Length. 0 - AES 128&256 bit, 1 - AES 128 bit, 2 - AES 256 bit. Default is 0 -->
 <!-- # Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P2683>0</P2683>
 
 <!-- #Crypto Life Time -->
 <!-- #0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2663>0</P2663>
 
 <!-- # Symmetric RTP. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P660>0</P660>
 
 <!-- # Silence Suppression 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P685>0</P685>
 
 <!-- # Voice Frames per TX (up to 10/20/32/64 frames for G711/G726/G723/other codecs respectively). Default is 2 -->
 <!-- # Number: 1 - 64 -->
-<!-- # Mandatory -->
 <P686>2</P686>
 
 <!-- # G723 Rate. 0 - 6.3kbps encoding rate, 1 - 5.3kbps encoding rate. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P693>1</P693>
 
 <!-- # G.726-32 Packing Mode. 0 - ITU, 1 - IETF. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2623>0</P2623>
 
 <!-- # iLBC Frame Size. 0 - 20ms, 1 - 30ms. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P695>1</P695>
 
 <!-- # iLBC Payload Type. Default is 97 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P694>97</P694>
 
 <!-- # Jitter Buffer Type. 0 - Fixed, 1 - Adaptive. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P698>1</P698>
 
 <!-- # Jitter Buffer Length.  -->
 <!-- # 0 - 100ms, 1 - 200ms, 2 - 300ms, 3 - 400ms, 4 - 500ms, 5 - 600ms, 6 - 700ms, 7 - 800ms. Default is 2 -->
 <!-- # Number: 0, 1, 2, 3, 4, 5, 6, 7 -->
-<!-- # Mandatory -->
 <P697>2</P697>
 
 <!-- # Hide Vocoder. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P26347>0</P26347>
 
 <!-- # DTMF Delay. Default is 250 -->
 <!-- # Number: 100 - 250  -->
-<!-- # Mandatory -->
 <P26360>250</P26360>
 
 <!-- ########################################## -->
@@ -3158,7 +2598,6 @@
 <!-- ########################################## -->
 <!-- # Early Dial (use "Yes" only if proxy supports 484 response). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P622>0</P622>
 
 <!-- # Dial Plan Prefix -->
@@ -3167,17 +2606,14 @@
 
 <!-- # Dial Plan. Default is { x+ | \+x+ | *x+ | *xx*x+ } -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P659>{$grandstream_dial_plan}</P659>
 
 <!-- # Call Log. 0 - Log All Calls, 1 - Log Incoming/Outgoing only (Missed calls NOT recorded), 2 - Disable Call Log. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P642>0</P642>
 
 <!-- # Account Ring Tone. 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone, 4 - silent. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P623>0</P623>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 1 -->
@@ -3187,7 +2623,6 @@
 <!-- # Matching Rule 1 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1507>0</P1507>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 2 -->
@@ -3197,7 +2632,6 @@
 <!-- # Matching Rule 2 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1509>0</P1509>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 3 -->
@@ -3207,67 +2641,54 @@
 <!-- # Matching Rule 3 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1511>0</P1511>
 
 <!-- # Ring Timeout (in seconds). Default is 60 -->
 <!-- # Number: 30 - 3600 -->
-<!-- # Mandatory -->
 <P676>60</P676>
 
 <!-- # Send Anonymous (caller ID will be blocked if set to Yes). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P621>0</P621>
 
 <!-- # Anonymous Call Rejection. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P646>0</P646>
 
 <!-- # Auto Answer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P625>0</P625>
 
 <!-- # Refer-To Use Target Contact. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P669>0</P669>
 
 <!-- # Transfer on conference Hang-Up. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2604>0</P2604>
 
 <!-- #Disable Recovery on Blind Transfer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2684>0</P2684>
 
 <!-- # Blind Transfer Wait Timeout. Default is 30 -->
 <!-- # Number: 30 - 300 -->
-<!-- # Mandatory -->
 <P26370>30</P26370>
 
 <!-- # No Key Entry Timeout. Default is 4 -->
 <!-- # Number: 1 - 15 -->
-<!-- # Mandatory -->
 <P691>4</P691>
 
 <!-- # Use # As Dial Key. 0 - No, 1 - Yes -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P692>1</P692>
 
 <!-- #On Hold Reminder Tone. 0 - Disabled, 1 - Enable. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26306>0</P26306>
 
 <!-- # RFC2543 Hold. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26362>1</P26362>
 
 <!-- # Hiding Dialing Password -->
@@ -3277,35 +2698,29 @@
 
 <!-- # Password length. Default is 0 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P26350>0</P26350>
 
 <!-- # Disable Call Waiting. 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
-<P26363>0</P26363>
+<P26363>{$grandstream_call_waiting}</P26363>
 
 <!-- ############################################################### -->
 <!-- # Account 4/Intercom Settings -->
 <!-- ############################################################### -->
 <!-- # Allow Auto Answer by Call-Info/Alert-Info. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P638>0</P638>
 
 <!-- # Allow Barging by Call-Info/Alert-Info. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26319>0</P26319>
 
 <!-- # Mute on answer Intercom call. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26371>0</P26371>
 
 <!-- # Play warning tone for Auto Answer Intercom. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26372>0</P26372>
 
 <!-- # Custom Call-Info for Auto Answer. -->
@@ -3318,7 +2733,6 @@
 <!-- ########################################## -->
 <!-- #Enable Call Features.  0 - No, 1 - Yes. Default is 1 -->
 <!-- #Number: 0, 1  -->
-<!-- #Mandatory -->
 <P620>1</P620>
 
 <!-- #Do Not Disturb (DND) - On -->
@@ -3355,7 +2769,6 @@
 
 <!-- #Delayed Call Forward Wait Time (in seconds). Default is 20 -->
 <!-- #Number: 1 - 120 -->
-<!-- #Mandatory -->
 <P670></P670>
 
 <!-- #################################################################### -->
@@ -3366,7 +2779,6 @@
 <!-- ########################################## -->
 <!-- # Account Active. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($user_password_5)}
 <P1701>1</P1701>
 {else}
@@ -3422,7 +2834,6 @@
 <!-- ########################################## -->
 <!-- # DNS Mode. 0 - A Record, 1 - SRV, 2 - NAPTR/SRV, 3 - Use Configured IP. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($grandstream_dns_mode)}
 <P1708>{$grandstream_dns_mode}</P1708>
 {else}
@@ -3431,7 +2842,6 @@
 
 <!-- # DNS SRV Fail-over Mode. 0 - Default, 1 - Saved one until DNS TTL, 2 - Saved one until no response. Default is 0 -->
 <!-- # Number: 0,1,2 -->
-<!-- # Mandatory -->
 <P26440>0</P26440>
 
 <!-- # Primary IP. Maximum 15 characters -->
@@ -3448,7 +2858,6 @@
 
 <!-- # NAT Traversal. 0 - No, 1 - STUN, 2 - keep alive, 3 - UPnP, 4 - Auto, 5 - VPN. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3, 4, 5 -->
-<!-- # Mandatory -->
 {if isset($grandstream_nat_traversal)}
 <P1714>{$grandstream_nat_traversal}</P1714>
 {else}
@@ -3464,74 +2873,60 @@
 <!-- ########################################## -->
 <!-- # TEL URI. 0 - Disabled, 1 - User=Phone, 2 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P1709>0</P1709>
 
 <!-- # SIP Registration. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1710>1</P1710>
 
 <!-- # Unregister On Reboot. 0 - No, 1 - Yes, 2 - Instance. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1711>0</P1711>
 
 <!-- # Register Expiration (in minutes. default 1 hour, max 45 days) -->
 <!-- # Number: 1-64800 -->
-<!-- # Mandatory -->
 <P1712>{$register_expires_5}</P1712>
 
 <!-- # Subscribe Expiration. Default is 60. Max about 45 days -->
 <!-- # Number: 1 - 64800 -->
-<!-- # Mandatory -->
 <P26451>60</P26451>
 
 <!-- # Reregister before Expiration (in seconds) Default is 0 -->
 <!-- # Number: 0 - 64800 -->
-<!-- # Mandatory -->
 <P2730>0</P2730>
 
 <!-- # Enable OPTIONS Keep Alive. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P2797>0</P2797>
 
 <!-- # OPTIONS Keep Alive Interval. Default is 30 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P2798>30</P2798>
 
 <!-- # OPTIONS Keep Alive Max Lost. Default is 3 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P2799>30</P2799>
 
 <!-- # Local SIP Port. Default is 5068 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P1713>5068</P1713>
 
 <!-- # SIP Registration Failure Retry Wait Time (in seconds). Default is 20 -->
 <!-- # Number: 1 - 3600 -->
-<!-- # Mandatory -->
 <P1771>20</P1771>
 
 <!-- # SIP T1 Timeout. RFC 3261 T1 value (RTT estimate) -->
 <!-- # 50 - 0.5 sec, 100 - 1 sec, 200 - 2 sec. Default is 100 -->
 <!-- # Number: 50, 100, 200 -->
-<!-- # Mandatory -->
 <P1740>50</P1740>
 
 <!-- # SIP T2 Timeout. RFC 3261 T2 value. The maximum retransmit interval for non-INVITE requests and INVITE responses -->
 <!-- # 200 - 2 sec, 400 - 4 sec, 800 - 8 sec. Default is 400 -->
 <!-- # Number: 200, 400, 800 -->
-<!-- # Mandatory -->
 <P1741>400</P1741>
 
 <!-- # SIP Transport. 0 - UDP, 1 - TCP. 2 - TCP/TLS. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 {$tp=0}
 {if $sip_transport_5 == 'udp'}{$tp=0}{/if}
 {if $sip_transport_5 == 'tcp'}{$tp=1}{/if}
@@ -3542,32 +2937,26 @@
 <!-- # SIP Listening Mode.  -->
 <!-- # 0 - Transport Only, 1 - Dual, 2 - Dual (BLF Enforced), 3 - Dual (Secured). Default is 0 -->
 <!-- # Number: 0,1,2,3 -->
-<!-- # Mandatory -->
 <P26424>0</P26424>
 
 <!-- # SIP URI Scheme when using TLS. 0 - sip, 1 - sips. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2729>1</P2729>
 
 <!-- # Use Actual Ephemeral Port in Contact with TCP/TLS. 0 - No, 1- Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2731>0</P2731>
 
 <!-- # Outbound Proxy Mode. 0 - in route, 1 - not in route, 2 - always send to -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2705>0</P2705>
 
 <!-- # Support SIP Instace ID. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1789>1</P1789>
 
 <!-- # SUBSCRIBE for MWI (Whether or not send SUBSCRIBE for Message Waiting Indication). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($subscribe_mwi)}
 <P1715>1</P1715>
 {else}
@@ -3576,40 +2965,33 @@
 
 <!-- # SUBSCRIBE for Registration. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2719>0</P2719>
 
 <!-- # Enable 100rel. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1735>0</P1735>
 
 <!-- # Callee ID Display. 0 - Auto, 1 - Disabled, 2 - From Header. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26425>0</P26425>
 
 <!-- # Caller ID Display. 0 - Auto, 1 - Disabled, 2 - From Header. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2724>0</P2724>
 
 <!-- # Add Auth Header On Initial REGISTER -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2759>0</P2759>
 
 <!-- #Allow SIP Reset -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- #Mandatory -->
 <P26415>0 </P26415>
 
 <!-- # Ignore Alert-Info header -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26418>0</P26418>
 
 <!-- ############################################################### -->
@@ -3619,37 +3001,31 @@
 <!-- # Use Privacy Header -->
 <!-- # 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2738>0</P2738>
 
 <!-- # Use P-Preferred-Identity Header -->
 <!-- # 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2739>0</P2739>
 
 <!-- # Use X-Grandstream-PBX Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26454>1</P26454>
 
 <!-- # Use P-Access-Network-Info Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26458>1</P26458>
 
 <!-- # Use P-Emergency-Info Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26459>1</P26459>
 
 <!-- # Use MAC Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26461>1</P26461>
 
 <!-- ########################################## -->
@@ -3657,7 +3033,6 @@
 <!-- ########################################## -->
 <!-- # Line-Seize Timeout (in seconds). Default is 15 -->
 <!-- # Number: 15 - 60 -->
-<!-- # Mandatory -->
 <P2713>15</P2713>
 
 <!-- # Eventlist BLF URI -->
@@ -3666,7 +3041,6 @@
 
 <!-- #Auto Provision Eventlist BLFs. 0-Disabled, 1-Enabled. Default is 0 -->
 <!-- #Number:0,1 -->
-<!-- #Mandatory -->
 <P2789>0</P2789>
 
 <!-- # Conference URI -->
@@ -3679,12 +3053,10 @@
 
 <!-- # Force BLF Call-pickup by prefix. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P6756>0</P6756>
 
 <!-- # BLF Call-pickup Prefix. Default is ** -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P1781>**</P1781>
 
 <!-- # Call Pickup Barge-In Code -->
@@ -3693,53 +3065,43 @@
 
 <!-- # PUBLISH for Presence. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1788>0</P1788>
 
 <!-- # Omit charset=UTF-8 in MESSAGE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2755>0</P2755>
 
 <!-- # Allow Unsolicited REFER. 0 - Disabled, 1 - Enabled, 2 - Enabled/Force Auth. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26423>0</P26423>
 
 <!-- # Special Feature. 100 - Standard, 101 - Nortel MCS, 102- Broadsoft, 108 - CBCOM, 109 - RNK, 110 - Sylantro, 117 - Huawei IMS. Default is 100 -->
 <!-- # Number: 100, 101, 102, 108, 109, 110, 117 -->
-<!-- # Mandatory -->
 <P1724>100</P1724>
 
 <!-- # Broadsoft -->
 <!-- # Broadsoft Call Center. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2741>0</P2741>
 
 <!-- # Hoteling Event. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2742>0</P2742>
 
 <!-- # Call Center Status. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2743>0</P2743>
 
 <!-- # Broadsoft Executive Assistant. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2764>0</P2764>
 
 <!-- # Feature Key Synchronization. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2725>0</P2725>
 
 <!-- # Broadsoft Call Park. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2788>0</P2788>
 
 <!-- ########################################## -->
@@ -3747,48 +3109,39 @@
 <!-- ########################################## -->
 <!-- # Enable Session Timer. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2795>1</P2795>
 
 <!-- # Session Expiration (in seconds). Default is 180 -->
 <!-- # Number: 90 - 64800 -->
-<!-- # Mandatory -->
 <P1734>180</P1734>
 
 <!-- # Minimum SE (in seconds). Default is 90. The value must be lower than or equal to P1734 -->
 <!-- # Number: 90 - 64800 -->
-<!-- # Mandatory -->
 <P1727>90</P1727>
 
 <!-- # Caller Request Timer (Request for timer when calling). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1728>0</P1728>
 
 <!-- # Callee Request Timer (Request for timer when called. i.e. if remote party supports timer but did not request for one) -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1729>0</P1729>
 
 <!-- # Force Timer (Still use timer when remote party does not support timer). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1730>0</P1730>
 
 <!-- # UAC Specify Refresher. 0 - omit, 1 - UAC, 2 - UAS. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P1732>0</P1732>
 
 <!-- # UAS Specify Refresher. 1 - UAC, 2 - UAS. Default is 1 -->
 <!-- # Number: 1, 2 -->
-<!-- # Mandatory -->
 <P1733>1</P1733>
 
 <!-- # Force INVITE (Always refresh with INVITE instead of UPDATE even when remote party supports UPDATE). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1731>0</P1731>
 
 <!-- ########################################## -->
@@ -3797,32 +3150,26 @@
 <!-- # Check Domain Certificates. When set to Yes/Enabled, domain certificate will be checked as defined in RFC5922 -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2711>0</P2711>
 
 <!-- # Validate Certification Chain. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2767>0</P2767>
 
 <!-- # Validate Incoming Messages. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2706>0</P2706>
 
 <!-- # Check SIP User ID for incoming INVITE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1749>0</P1749>
 
 <!-- # Accept Incoming SIP from Proxy Only. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2747>1</P2747>
 
 <!-- # Authenticate Incoming INVITE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2746>0</P2746>
 
 <!-- ########################################## -->
@@ -3830,91 +3177,74 @@
 <!-- ########################################## -->
 <!-- # Send DTMF: In-audio. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2701>0</P2701>
 
 <!-- # Send DTMF: Via RTP (RFC2833). 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2702>1</P2702>
 
 <!-- # Send DTMF: Via SIP INFO. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2703>0</P2703>
 
 <!-- # OPUS Payload Type. Default is 123 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P2785>123</P2785>
 
 <!-- # DTMF Payload Type. Default is 101 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P1796>101</P1796>
 
 <!-- # Preferred Vocoder -->
 <!-- # 0 - PCMU, 2 - G.726-32, 8 - PCMA, 9 - G.722, 18 - G.729A/B, 4 - G.723.1, 98 - iLBC, 125 - OPUS -->
 <!-- # choice 1. Default is 0 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1751>0</P1751>
 
 <!-- # choice 2. Default is 8 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1752>8</P1752>
 
 <!-- # choice 3. Default is 4 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1753>4</P1753>
 
 <!-- # choice 4. Default is 18 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125   -->
-<!-- # Mandatory -->
 <P1754>18</P1754>
 
 <!-- # choice 5. Default is 9 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1755>9</P1755>
 
 <!-- # choice 6. Default is 98 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1756>98</P1756>
 
 <!-- # choice 7. Default is 2 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1757>2</P1757>
 
 <!-- # choice 8. Default is 125 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1758>125</P1758>
 
 <!-- # Use First Matching Vocoder in 200OK SDP. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2748>0</P2748>
 
 <!-- # Codec Negotiation Priority. 0 - Caller, 1 - Callee. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P29461>1</P29461>
 
 <!-- #Disable Multiple m line in SDP -->
 <!-- #0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1787>0</P1787>
 
 <!-- # SRTP Mode -->
 <!-- # 0 - Disabled, 1 - Enabled but not forced, 2 - Enabled and forced, 3 - Optional. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($grandstream_srtp)}
 <P1743>{$grandstream_srtp}</P1743>
 {else}
@@ -3924,69 +3254,56 @@
 <!-- # SRTP Key Length. 0 - AES 128&256 bit, 1 - AES 128 bit, 2 - AES 256 bit. Default is 0 -->
 <!-- # Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P2783>0</P2783>
 
 <!-- #Crypto Life Time -->
 <!-- #0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2763>0</P2763>
 
 <!-- # Symmetric RTP. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1760>0</P1760>
 
 <!-- # Silence Suppression 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1785>0</P1785>
 
 <!-- # Voice Frames per TX (up to 10/20/32/64 frames for G711/G726/G723/other codecs respectively). Default is 2 -->
 <!-- # Number: 1 - 64 -->
-<!-- # Mandatory -->
 <P1786>2</P1786>
 
 <!-- # G723 Rate. 0 - 6.3kbps encoding rate, 1 - 5.3kbps encoding rate. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1793>1</P1793>
 
 <!-- # G.726-32 Packing Mode. 0 - ITU, 1 - IETF. Default is 0. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2723>0</P2723>
 
 <!-- # iLBC Frame Size. 0 - 20ms, 1 - 30ms. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1795>1</P1795>
 
 <!-- # iLBC Payload Type. Default is 97 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P1794>97</P1794>
 
 <!-- # Jitter Buffer Type. 0 - Fixed, 1 - Adaptive. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1798>1</P1798>
 
 <!-- # Jitter Buffer Length. 0 - 100ms, 1 - 200ms, 2 - 300ms, 3 - 400ms, 4 - 500ms, 5 - 600ms, 6 - 700ms, 7 - 800ms. Default is 2 -->
 <!-- # Number: 0 - 7 -->
-<!-- # Mandatory -->
 <P1797>2</P1797>
 
 <!-- # Hide Vocoder. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P26447>0</P26447>
 
 <!-- # DTMF Delay. Default is 250 -->
 <!-- # Number: 100 - 250  -->
-<!-- # Mandatory -->
 <P26460>250</P26460>
 
 <!-- ########################################## -->
@@ -3994,7 +3311,6 @@
 <!-- ########################################## -->
 <!-- # Early Dial (use "Yes" only if proxy supports 484 response). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1722>0</P1722>
 
 <!-- # Dial Plan Prefix -->
@@ -4003,17 +3319,14 @@
 
 <!-- # Dial Plan. Default is { x+ | \+x+ | *x+ | *xx*x+ } -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P1759>{$grandstream_dial_plan}</P1759>
 
 <!-- # Call Log. 0 - Log All, 1 - Log Incoming/Outgoing only (Missed calls NOT recorded), 2 - Disable Call Log. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P1742>0</P1742>
 
 <!-- # Account Ring Tone. 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone, 4 - silent. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1723>0</P1723>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 1. -->
@@ -4023,7 +3336,6 @@
 <!-- # Matching Rule 1 Distinctive Ringtone. -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1513>0</P1513>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 2 -->
@@ -4033,7 +3345,6 @@
 <!-- # Matching Rule 2 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1515>0</P1515>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 3 -->
@@ -4043,67 +3354,54 @@
 <!-- # Matching Rule 3 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1517>0</P1517>
 
 <!-- # Ring Timeout (in seconds). Default is 60 -->
 <!-- # Number: 30 - 3600 -->
-<!-- # Mandatory -->
 <P1776>60</P1776>
 
 <!-- # Send Anonymous (caller ID will be blocked if set to Yes). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1721>0</P1721>
 
 <!-- # Anonymous Call Rejection. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1746>0</P1746>
 
 <!-- # Auto Answer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1725>0</P1725>
 
 <!-- # Refer-To Use Target Contact. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1769>0</P1769>
 
 <!-- # Transfer on conference Hang-Up. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2704>0</P2704>
 
 <!-- #Disable Recovery on Blind Transfer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2784>0</P2784>
 
 <!-- # Blind Transfer Wait Timeout. Default is 30 -->
 <!-- # Number: 30 - 300 -->
-<!-- # Mandatory -->
 <P26470>30</P26470>
 
 <!-- # No Key Entry Timeout. Default is 4 -->
 <!-- # Number: 1 - 15 -->
-<!-- # Mandatory -->
 <P791>4</P791>
 
 <!-- # Use # As Dial Key. 0 - No, 1 - Yes -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P792>1</P792>
 
 <!-- #On Hold Reminder Tone. 0 - Disabled, 1 - Enable. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26406>0</P26406>
 
 <!-- # RFC2543 Hold. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26462>1</P26462>
 
 <!-- # Hiding Dialing Password -->
@@ -4113,35 +3411,29 @@
 
 <!-- # Password length. Default is 0 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P26450>0</P26450>
 
 <!-- # Disable Call Waiting. 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
-<P26463>0</P26463>
+<P26463>{$grandstream_call_waiting}</P26463>
 
 <!-- ############################################################### -->
 <!-- # Account 5/Intercom Settings -->
 <!-- ############################################################### -->
 <!-- # Allow Auto Answer by Call-Info/Alert-Info. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P738>0</P738>
 
 <!-- # Allow Barging by Call-Info/Alert-Info. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26419>0</P26419>
 
 <!-- # Mute on answer Intercom call. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26471>0</P26471>
 
 <!-- # Play warning tone for Auto Answer Intercom. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26472>0</P26472>
 
 <!-- # Custom Call-Info for Auto Answer. -->
@@ -4154,7 +3446,6 @@
 <!-- ########################################## -->
 <!-- #Enable Call Features.  0 - No, 1 - Yes. Default is 1 -->
 <!-- #Number: 0, 1  -->
-<!-- #Mandatory -->
 <P1720>1</P1720>
 
 <!-- #Do Not Disturb (DND) - On -->
@@ -4191,7 +3482,6 @@
 
 <!-- #Delayed Call Forward Wait Time (in seconds). Default is 20 -->
 <!-- #Number: 1 - 120 -->
-<!-- #Mandatory -->
 <P1770></P1770>
 
 <!-- #################################################################### -->
@@ -4202,7 +3492,6 @@
 <!-- ########################################## -->
 <!-- # Account Active. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($user_password_6)}
 <P1801>1</P1801>
 {else}
@@ -4259,7 +3548,6 @@
 <!-- ########################################## -->
 <!-- # DNS Mode. 0 - A Record, 1 - SRV, 2 - NAPTR/SRV, 3 - Use Configured IP. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($grandstream_dns_mode)}
 <P1808>{$grandstream_dns_mode}</P1808>
 {else}
@@ -4268,7 +3556,6 @@
 
 <!-- # DNS SRV Fail-over Mode. 0 - Default, 1 - Saved one until DNS TTL, 2 - Saved one until no response. Default is 0 -->
 <!-- # Number: 0,1,2 -->
-<!-- # Mandatory -->
 <P26540>0</P26540>
 
 <!-- # Primary IP. Maximum 15 characters -->
@@ -4285,7 +3572,6 @@
 
 <!-- # NAT Traversal. 0 - No, 1 - STUN, 2 - keep alive, 3 - UPnP, 4 - Auto, 5 - VPN. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3, 4, 5 -->
-<!-- # Mandatory -->
 {if isset($grandstream_nat_traversal)}
 <P1814>{$grandstream_nat_traversal}</P1814>
 {else}
@@ -4294,7 +3580,6 @@
 
 <!-- # Proxy-Require (A SIP extension to enable firewall penetration). Max length is 64 characters -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P1818></P1818>
 
 <!-- ########################################## -->
@@ -4302,74 +3587,60 @@
 <!-- ########################################## -->
 <!-- # TEL URI. 0 - Disabled, 1 - User=Phone, 2 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P1809>0</P1809>
 
 <!-- # SIP Registration. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1810>1</P1810>
 
 <!-- # Unregister On Reboot. 0 - No, 1 - Yes, 2 - Instance. Default is 0. -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1811>0</P1811>
 
 <!-- # Register Expiration (in minutes). Default is 60. Max is 45 days -->
 <!-- # Number: 1 - 64800 -->
-<!-- # Mandatory -->
 <P1812>{$register_expires_6}</P1812>
 
 <!-- # Subscribe Expiration. Default is 60. Max about 45 days -->
 <!-- # Number: 1 - 64800 -->
-<!-- # Mandatory -->
 <P26551>60</P26551>
 
 <!-- # Reregister before Expiration (in seconds). Default is 0 -->
 <!-- # Number: 1 - 64800 -->
-<!-- # Mandatory -->
 <P2830>0</P2830>
 
 <!-- # Enable OPTIONS Keep Alive. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P2897>0</P2897>
 
 <!-- # OPTIONS Keep Alive Interval. Default is 30 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P2898>30</P2898>
 
 <!-- # OPTIONS Keep Alive Max Lost. Default is 3 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P2899>30</P2899>
 
 <!-- # Local SIP Port. Default is 5070 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P1813>5070</P1813>
 
 <!-- # SIP Registration Failure Retry Wait Time (in seconds) Default is 20 -->
 <!-- # Number: 1 - 3600 -->
-<!-- # Mandatory -->
 <P1871>20</P1871>
 
 <!-- # SIP T1 Timeout. RFC 3261 T1 value (RTT estimate) -->
 <!-- # 50 - 0.5 sec, 100 - 1 sec, 200 - 2 sec. Default is 100 -->
 <!-- # Number: 50, 100, 200 -->
-<!-- # Mandatory -->
 <P1840>50</P1840>
 
 <!-- # SIP T2 Timeout. RFC 3261 T2 value. The maximum retransmit interval for non-INVITE requests and INVITE responses. -->
 <!-- # 200 - 2 sec, 400 - 4 sec, 800 - 8 sec. Default is 400. -->
 <!-- # Number: 200, 400, 800 -->
-<!-- # Mandatory -->
 <P1841>400</P1841>
 
 <!-- # SIP Transport. 0 - UDP, 1 - TCP, 2 - TCP/TLS. Default is 2 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 {$tp=0}
 {if $sip_transport_6 == 'udp'}{$tp=0}{/if}
 {if $sip_transport_6 == 'tcp'}{$tp=1}{/if}
@@ -4380,32 +3651,26 @@
 <!-- # SIP Listening Mode.  -->
 <!-- # 0 - Transport Only, 1 - Dual, 2 - Dual (BLF Enforced), 3 - Dual (Secured). Default is 0 -->
 <!-- # Number: 0,1,2,3 -->
-<!-- # Mandatory -->
 <P26524>0</P26524>
 
 <!-- # SIP URI Scheme when using TLS. 0 - sip, 1 - sips. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2829>1</P2829>
 
 <!-- # Use Actual Ephemeral Port in Contact with TCP/TLS. 0 - No, 1- Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2831>0</P2831>
 
 <!-- # Outbound Proxy Mode. 0 - in route, 1 - not in route, 2 - always send to -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2805>0</P2805>
 
 <!-- # Support SIP Instace ID. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1889>1</P1889>
 
 <!-- # SUBSCRIBE for MWI (Whether or not send SUBSCRIBE for Message Waiting Indication). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($subscribe_mwi)}
 <P1815>1</P1815>
 {else}
@@ -4414,40 +3679,33 @@
 
 <!-- # SUBSCRIBE for Registration. 0 - No, 1 - Yes. Default is 0. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2819>0</P2819>
 
 <!-- # Enable 100rel. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1835>0</P1835>
 
 <!-- # Callee ID Display. 0 - Auto, 1 - Disabled, 2 - From Header. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26525>0</P26525>
 
 <!-- # Caller ID Display. 0 - Auto, 1 - Disabled, 2 - From Header. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2824>0</P2824>
 
 <!-- # Add Auth Header On Initial REGISTER -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2859>0</P2859>
 
 <!-- #Allow SIP Reset -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- #Mandatory -->
 <P26515>0</P26515>
 
 <!-- # Ignore Alert-Info header -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26518>0</P26518>
 
 <!-- ############################################################### -->
@@ -4457,37 +3715,31 @@
 <!-- # Use Privacy Header -->
 <!-- # 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2838>0</P2838>
 
 <!-- # Use P-Preferred-Identity Header -->
 <!-- # 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P2839>0</P2839>
 
 <!-- # Use X-Grandstream-PBX Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26554>1</P26554>
 
 <!-- # Use P-Access-Network-Info Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26558>1</P26558>
 
 <!-- # Use P-Emergency-Info Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26559>1</P26559>
 
 <!-- # Use MAC Header -->
 <!-- # 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26561>1</P26561>
 
 <!-- ########################################## -->
@@ -4495,7 +3747,6 @@
 <!-- ########################################## -->
 <!-- # Line-Seize Timeout (in seconds). Default is 15 -->
 <!-- # Number: 15 - 60 -->
-<!-- # Mandatory -->
 <P2813>15</P2813>
 
 <!-- # Eventlist BLF URI -->
@@ -4504,7 +3755,6 @@
 
 <!-- #Auto Provision Eventlist BLFs. 0-Disabled, 1-Enabled. Default is 0 -->
 <!-- #Number:0,1 -->
-<!-- #Mandatory -->
 <P2889>0</P2889>
 
 <!-- # Conference URI -->
@@ -4517,12 +3767,10 @@
 
 <!-- # Force BLF Call-pickup by prefix. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P6757>0</P6757>
 
 <!-- # BLF Call-pickup Prefix. Default is ** -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P1881>**</P1881>
 
 <!-- # Call Pickup Barge-In Code -->
@@ -4531,53 +3779,43 @@
 
 <!-- # PUBLISH for Presence. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1888>0</P1888>
 
 <!-- # Omit charset=UTF-8 in MESSAGE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2855>0  </P2855>
 
 <!-- # Allow Unsolicited REFER. 0 - Disabled, 1 - Enabled, 2 - Enabled/Force Auth. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26523>0</P26523>
 
 <!-- # Special Feature.100 - Standard, 101 - Nortel MCS, 102- Broadsoft, 108 - CBCOM, 109 - RNK, 110 - Sylantro, 117 - Huawei IMS. Default is 100 -->
 <!-- # Number: 100, 101, 102, 108, 109, 110, 117 -->
-<!-- # Mandatory -->
 <P1824>100</P1824>
 
 <!-- # Broadsoft -->
 <!-- # Broadsoft Call Center. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2841>0</P2841>
 
 <!-- # Hoteling Event. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2842>0</P2842>
 
 <!-- # Call Center Status. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2843>0</P2843>
 
 <!-- # Broadsoft Executive Assistant. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2864>0</P2864>
 
 <!-- # Feature Key Synchronization. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2825>0</P2825>
 
 <!-- # Broadsoft Call Park. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2888>0</P2888>
 
 <!-- ########################################## -->
@@ -4585,50 +3823,41 @@
 <!-- ########################################## -->
 <!-- # Enable Session Timer. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2895>1</P2895>
 
 <!-- # Session Expiration (in seconds). Default is 180 -->
 <!-- # Number: 0 - 64800 -->
-<!-- # Mandatory -->
 <P1834>180</P1834>
 
 <!-- # Minimum SE (in seconds). Default is 90. This value must be lower than or equal to P1834 -->
 <!-- # Number: 0 - 64800 -->
-<!-- # Mandatory -->
 <P1827>90</P1827>
 
 <!-- # Caller Request Timer (Request for timer when calling). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1828>0</P1828>
 
 <!-- # Callee Request Timer (Request for timer when called. i.e. if remote party supports timer but did not request for one) -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1829>0</P1829>
 
 <!-- # Force Timer (Still use timer when remote party does not support timer) -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1830>0</P1830>
 
 <!-- # UAC Specify Refresher. 0 - omit, 1 - UAC, 2 - UAS. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P1832>0</P1832>
 
 <!-- # UAS Specify Refresher. 1 - UAC, 2 - UAS. Default is 1 -->
 <!-- # Number: 1, 2 -->
-<!-- # Mandatory -->
 <P1833>1</P1833>
 
 <!-- # Force INVITE (Always refresh with INVITE instead of UPDATE even when remote party supports UPDATE) -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1831>0</P1831>
 
 <!-- ########################################## -->
@@ -4637,32 +3866,26 @@
 <!-- # Check Domain Certificates. When set to Yes/Enabled, the domain certificate will be checked as defined in RFC5922 -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2811>0</P2811>
 
 <!-- # Validate Certification Chain. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2867>0</P2867>
 
 <!-- # Validate Incoming Messages. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2806>0</P2806>
 
 <!-- # Check SIP User ID for incoming INVITE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1849>0</P1849>
 
 <!-- # Accept Incoming SIP from Proxy Only. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2847>1</P2847>
 
 <!-- # Authenticate Incoming INVITE. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2846>0</P2846>
 
 <!-- ########################################## -->
@@ -4670,91 +3893,74 @@
 <!-- ########################################## -->
 <!-- # Send DTMF: In-audio. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2801>0</P2801>
 
 <!-- # Send DTMF: Via RTP (RFC2833). 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2802>1</P2802>
 
 <!-- # Send DTMF: Via SIP INFO. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2803>0</P2803>
 
 <!-- # OPUS Payload Type. Default is 123 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P2885>123</P2885>
 
 <!-- # DTMF Payload Type. Default is 101 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P1896>101</P1896>
 
 <!-- # Preferred Vocoder -->
 <!-- # 0 - PCMU, 2 - G.726-32, 8 - PCMA, 9 - G.722, 18 - G.729A/B, 4 - G.723.1, 98 - iLBC, 125 - OPUS -->
 <!-- # choice 1. Default is 0 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1851>0</P1851>
 
 <!-- # choice 2. Default is 8 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125   -->
-<!-- # Mandatory -->
 <P1852>8</P1852>
 
 <!-- # choice 3. Default is 4 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1853>4</P1853>
 
 <!-- # choice 4. Default is 18 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1854>18</P1854>
 
 <!-- # choice 5. Default is 9 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1855>9</P1855>
 
 <!-- # choice 6. Default is 98 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125   -->
-<!-- # Mandatory -->
 <P1856>98</P1856>
 
 <!-- # choice 7. Default is 2 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1857>2</P1857>
 
 <!-- # choice 8. Default is 125 -->
 <!-- # Number: 0, 2, 4, 8, 9, 18, 98, 125  -->
-<!-- # Mandatory -->
 <P1858>125</P1858>
 
 <!-- # Use First Matching Vocoder in 200OK SDP. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2848>0</P2848>
 
 <!-- # Codec Negotiation Priority. 0 - Caller, 1 - Callee. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P29561>1</P29561>
 
 <!-- #Disable Multiple m line in SDP -->
 <!-- #0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1887>0</P1887>
 
 <!-- # SRTP Mode -->
 <!-- # 0 - Disabled, 1 - Enabled but not forced, 2 - Enabled and forced, 3 - Optional. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($grandstream_srtp)}
 <P1843>{$grandstream_srtp}</P1843>
 {else}
@@ -4764,69 +3970,56 @@
 <!-- # SRTP Key Length. 0 - AES 128&256 bit, 1 - AES 128 bit, 2 - AES 256 bit. Default is 0 -->
 <!-- # Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P2883>0</P2883>
 
 <!-- #Crypto Life Time -->
 <!-- #0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2863>0</P2863>
 
 <!-- # Symmetric RTP. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1860>0</P1860>
 
 <!-- # Silence Suppression 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1885>0</P1885>
 
 <!-- # Voice Frames per TX (up to 10/20/32/64 frames for G711/G726/G723/other codecs respectively). Default is 2 -->
 <!-- # Number: 1 - 64 -->
-<!-- # Mandatory -->
 <P1886>2</P1886>
 
 <!-- # G723 Rate. 0 - 6.3kbps encoding rate, 1 - 5.3kbps encoding rate. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1893>1</P1893>
 
 <!-- # G.726-32 Packing Mode. 0 - ITU, 1 - IETF. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2823>0</P2823>
 
 <!-- # iLBC Frame Size. 0 - 20ms, 1 - 30ms. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1895>1</P1895>
 
 <!-- # iLBC Payload Type. Default is 97 -->
 <!-- # Number: 96 - 127 -->
-<!-- # Mandatory -->
 <P1894>97</P1894>
 
 <!-- # Jitter Buffer Type. 0 - Fixed, 1 - Adaptive. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1898>1</P1898>
 
 <!-- # Jitter Buffer Length. 0 - 100ms, 1 - 200ms, 2 - 300ms, 3 - 400ms, 4 - 500ms, 5 - 600ms, 6 - 700ms, 7 - 800ms. Default is 2 -->
 <!-- # Number: 0-7 -->
-<!-- # Mandatory -->
 <P1897>2</P1897>
 
 <!-- # Hide Vocoder. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P26547>0</P26547>
 
 <!-- # DTMF Delay. Default is 250 -->
 <!-- # Number: 100 - 250  -->
-<!-- # Mandatory -->
 <P26560>250</P26560>
 
 <!-- ########################################## -->
@@ -4834,7 +4027,6 @@
 <!-- ########################################## -->
 <!-- # Early Dial (use "Yes" only if proxy supports 484 response). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1822>0</P1822>
 
 <!-- # Dial Plan Prefix -->
@@ -4843,17 +4035,14 @@
 
 <!-- # Dial Plan. Default is { x+ | \+x+ | *x+ | *xx*x+ } -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P1859>{$grandstream_dial_plan}</P1859>
 
 <!-- # Call Log. 0 - Log All, 1 - Log Incoming/Outgoing only (Missed calls NOT recorded), 2 - Disable Call Log. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P1842>0</P1842>
 
 <!-- # Account Ring Tone. 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone, 4 - silent. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1823>0</P1823>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 1 -->
@@ -4863,7 +4052,6 @@
 <!-- # Matching Rule 1 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1519>0</P1519>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 2 -->
@@ -4873,7 +4061,6 @@
 <!-- # Matching Rule 2 Distinctive Ringtone. -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1521>0</P1521>
 
 <!-- # Matching Incoming Caller ID. Matching Rule 3 -->
@@ -4883,47 +4070,38 @@
 <!-- # Matching Rule 3 Distinctive Ringtone -->
 <!-- # 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0. -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P1523>0</P1523>
 
 <!-- # Ring Timeout (in seconds). Default is 60 -->
 <!-- # Number: 30 - 3600 -->
-<!-- # Mandatory -->
 <P1876>60</P1876>
 
 <!-- # Send Anonymous (caller ID will be blocked if set to Yes). 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1821>0</P1821>
 
 <!-- # Anonymous Call Rejection. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1846>0</P1846>
 
 <!-- # Auto Answer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1825>0</P1825>
 
 <!-- # Refer-To Use Target Contact. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1869>0</P1869>
 
 <!-- # Transfer on conference Hang-Up. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2804>0</P2804>
 
 <!-- #Disable Recovery on Blind Transfer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2884>0</P2884>
 
 <!-- # Blind Transfer Wait Timeout. Default is 30 -->
 <!-- # Number: 30 - 300 -->
-<!-- # Mandatory -->
 <P26570>30</P26570>
 
 <!-- # No Key Entry Timeout. -->
@@ -4932,17 +4110,14 @@
 
 <!-- # Use # As Dial Key. 0 - No, 1 - Yes -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P892>1</P892>
 
 <!-- #On Hold Reminder Tone. 0 - Disabled, 1 - Enable. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26506>0</P26506>
 
 <!-- # RFC2543 Hold. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P26562>1</P26562>
 
 <!-- # Hiding Dialing Password -->
@@ -4952,35 +4127,29 @@
 
 <!-- # Password length. Default is 0 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P26550>0</P26550>
 
 <!-- # Disable Call Waiting. 0 - Default, 1 - No, 2 - Yes. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
-<P26563>0</P26563>
+<P26563>{$grandstream_call_waiting}</P26563>
 
 <!-- ############################################################### -->
 <!-- # Account 6/Intercom Settings -->
 <!-- ############################################################### -->
 <!-- # Allow Auto Answer by Call-Info/Alert-Info. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P838>0</P838>
 
 <!-- # Allow Barging by Call-Info/Alert-Info. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26519>0</P26519>
 
 <!-- # Mute on answer Intercom call. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26571>0</P26571>
 
 <!-- # Play warning tone for Auto Answer Intercom. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26572>0</P26572>
 
 <!-- # Custom Call-Info for Auto Answer. -->
@@ -4992,7 +4161,6 @@
 <!-- ########################################## -->
 <!-- #Enable Call Features.  0 - No, 1 - Yes. Default is 1 -->
 <!-- #Number: 0, 1  -->
-<!-- #Mandatory -->
 <P1820>1</P1820>
 
 <!-- #Do Not Disturb (DND) - On -->
@@ -5029,7 +4197,6 @@
 
 <!-- #Delayed Call Forward Wait Time (in seconds). Default is 20 -->
 <!-- #Number: 1 - 120 -->
-<!-- #Mandatory -->
 <P1870></P1870>
 
 <!-- ################################################################### -->
@@ -5037,12 +4204,10 @@
 <!-- ################################################################### -->
 <!-- # Internet Protocol. 0 - Both, prefer IPv4, 1 - Both, prefer IPv6, 2 - IPv4 Only, 3 - IPv6 Only Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 <P1415>0</P1415>
 
 <!-- # IP Address Mode. 0 - DHCP, 1 - Static IP, 2 - PPPoE. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <!-- # P8 = 0 -->
 
 <!-- ########################################## -->
@@ -5050,24 +4215,8 @@
 <!-- ########################################## -->
 <!-- # Host name, DHCP option 12. Max length allowed is 64 characters -->
 <!-- # String -->
-<P146></P146>
-
-<!-- # Vendor Class ID, DHCP option 60. Max length allowed is 64 characters -->
-<!-- # String -->
-<!-- # For GXP2130, Default value is Grandstream GXP2130. -->
-<!-- # P148 = Grandstream GXP2130 -->
-<!--   -->
-<!-- # For GXP2140, Default value is Grandstream GXP2140. -->
-<!-- # P148 = Grandstream GXP2140 -->
-
-<!-- # For GXP2160, Default value is Grandstream GXP2160. -->
-<!-- # P148 = Grandstream GXP2160 -->
-
-<!-- # For GXP2170, Default value is Grandstream GXP2170. -->
-<!-- # P148 = Grandstream GXP2170 -->
-
-<!-- # For GXP2135, Default value is Grandstream GXP2135. -->
-<!-- # P148 = Grandstream GXP2135 -->
+<!-- Set to acct 1 display name for easier identification in dhcp logs for troubleshooting -->
+<P146>phone-{$display_name_1}</P146>
 
 <!-- ########################################## -->
 <!-- # PPPoE -->
@@ -5090,85 +4239,84 @@
 <!-- ########################################## -->
 <!-- # IP Address. Ignore if DHCP or PPPoE is used -->
 <!-- # Number: 0 - 255 -->
-<P9>192</P9>
+<!-- <P9>192</P9>  -->
 
 <!-- # Number: 0 - 255 -->
-<P10>168</P10>
+<!-- <P10>168</P10> -->
 
 <!-- # Number: 0 - 255 -->
-<P11>0</P11>
+<!-- <P11>0</P11> -->
 
 <!-- # Number: 0 - 255 -->
-<P12>160</P12>
+<!-- <P12>160</P12> -->
 
 <!-- # Subnet mask. Ignore if DHCP or PPPoE is used -->
 <!-- # Number: 0 - 255 -->
-<P13>255</P13>
+<!-- <P13>255</P13> -->
 
 <!-- # Number: 0 - 255 -->
-<P14>255</P14>
+<!-- <P14>255</P14> -->
 
 <!-- # Number: 0 - 255 -->
-<P15>0</P15>
+<!-- <P15>0</P15> -->
 
 <!-- # Number: 0 - 255 -->
-<P16>0</P16>
+<!-- <P16>0</P16> -->
 
 <!-- # Gateway. Ignore if DHCP or PPPoE is used -->
 <!-- # Number: 0 - 255 -->
-<P17>0</P17>
+<!-- <P17>0</P17> -->
 
 <!-- # Number: 0 - 255 -->
-<P18>0</P18>
+<!-- <P18>0</P18> -->
 
 <!-- # Number: 0 - 255 -->
-<P19>0</P19>
+<!-- <P19>0</P19> -->
 
 <!-- # Number: 0 - 255 -->
-<P20>0</P20>
+<!-- <P20>0</P20> -->
 
 <!-- # DNS 1 Server. Ignore if DHCP or PPPoE is used -->
 <!-- # Number: 0 - 255 -->
-<P21>0</P21>
+<!-- <P21>0</P21> -->
 
 <!-- # Number: 0 - 255 -->
-<P22>0</P22>
+<!-- <P22>0</P22> -->
 
 <!-- # Number: 0 - 255 -->
-<P23>0</P23>
+<!-- <P23>0</P23> -->
 
 <!-- # Number: 0 - 255 -->
-<P24>0</P24>
+<!-- <P24>0</P24> -->
 
 <!-- # DNS 2 Server. Ignore if DHCP or PPPoE is used -->
 <!-- # Number: 0 - 255 -->
-<P25>0</P25>
+<!-- <P25>0</P25> -->
 
 <!-- # Number: 0 - 255 -->
-<P26>0</P26>
+<!-- <P26>0</P26> -->
 
 <!-- # Number: 0 - 255 -->
-<P27>0</P27>
+<!-- <P27>0</P27> -->
 
 <!-- # Number: 0 - 255 -->
-<P28>0</P28>
+<!-- <P28>0</P28> -->
 
 <!-- # Preferred DNS server.  (if specified). -->
 <!-- # Number: 0 - 255 -->
-<P92>0</P92>
+<!-- <P92>0</P92> -->
 
 <!-- # Number: 0 - 255 -->
-<P93>0</P93>
+<!-- <P93>0</P93> -->
 
 <!-- # Number: 0 - 255 -->
-<P94>0</P94>
+<!-- <P94>0</P94> -->
 
 <!-- # Number: 0 - 255 -->
-<P95>0</P95>
+<!-- <P95>0</P95> -->
 
 <!-- # IPv6 Address type. 0 - Auto Configured, 1 - Statically Configured. Default is 0. -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1419>0</P1419>
 
 <!-- # IPv6 Address type: Statically configured. 0 - Full Static, 1 - Prefix Static -->
@@ -5202,7 +4350,6 @@
 
 <!-- # 802.1X Mode. 0 - Disable, 1 - EAP-MD5. 2 - EAP-TLS, 3 - EAP-PEAPv0/MSCHAPv2. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 <P7901>0</P7901>
 
 <!-- # 802.1X Identity. Max length allowed is 64 characters -->
@@ -5235,22 +4382,18 @@
 
 <!-- # Layer 3 QoS for SIP -->
 <!-- # Number:0 - 63 -->
-<!-- # Mandatory -->
 <P1558>26 </P1558>
 
 <!-- # Layer 3 QoS for RTP -->
 <!-- # Number:0 - 63 -->
-<!-- # Mandatory -->
 <P1559>46 </P1559>
 
 <!-- # Enable DHCP VLAN. 0 - Disable, 1 - Enable. Default is 0. -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P8300>0</P8300>
 
 <!-- # Layer 2 QoS. 802.1Q/VLAN Tag (VLAN classification for RTP). Default is 0 -->
 <!-- # Number: 0 - 4094 -->
-<!-- # Mandatory -->
 {if isset($grandstream_lan_port_vlan) }
 <P51>{$grandstream_lan_port_vlan}</P51>
 {else}
@@ -5259,46 +4402,38 @@
 
 <!-- # Layer 2 QoS. 802.1p priority value (0 - 7). Default is 0 -->
 <!-- # Number: 0 - 7 -->
-<!-- # Mandatory -->
 <P87>0</P87>
 
 <!-- # PC Port Mode. 0 - Enable, 1 - Disabled, 2 - Mirrored. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P1348>0</P1348>
 
 <!-- # PC Port VLAN Tag. Default is 0  -->
 <!-- # Number: 0 - 4094 -->
-<!-- #Mandatory -->
 {if isset($grandstream_pc_port_vlan) }
 <P229>{$grandstream_pc_port_vlan}</P229>
 {else}
-<P229>1</P229>
+<P229>0</P229>
 {/if}
 
 <!-- # PC Port Priority Value. Default is 0  -->
 <!-- # Number: 0 - 7 -->
-<!-- # Mandatory -->
 <P230>0</P230>
 
 <!-- # Enable CDP.   0 - Disabled, 1 - Enabled. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P22119>1</P22119>
 
 <!-- # Enable LLDP.  0 - Disabled, 1 - Enabled. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1684>1</P1684>
 
 <!-- # LLDP TX Interval. Default is 30  -->
 <!-- # Number: 1 - 3600 -->
-<!-- # Mandatory -->
 <P22122>30</P22122>
 
 <!-- # Maximum Transmission Unit(MTU). Default is 1500 -->
 <!-- # Number: 576 - 1500 -->
-<!-- # Mandatory -->
 <P244>1500</P244>
 
 <!-- ############################################################################## -->
@@ -5307,12 +4442,10 @@
 <!-- # Affinity Support. 0 - Disabled, 1 - Enabled -->
 <!-- # Number: 0, 1. Default is 0 -->
 <!-- # 0 - No, 1 - Yes -->
-<!-- # Mandatory -->
 <P8334>0</P8334>
 
 <!-- # Preferred Account. 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4, 4 - Account 5, 5 - Account 6 -->
 <!-- # Number: 0 - 5. Default is 0 -->
-<!-- # Mandatory -->
 <P8335>0</P8335>
 
 <!-- ############################################################################## -->
@@ -5321,73 +4454,20 @@
 <!-- # Bluetooth Power. Default is 1. -->
 <!-- # 0 - Off, 1 - On, 2 - Off & Hide Menu From LCD -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 {if isset($grandstream_bluetooth_power)}
 <P2910>{$grandstream_bluetooth_power}</P2910>
-{else}
-<P2910>0</P2910>
 {/if}
 
 <!-- # Handsfree Mode. Default is 0. -->
 <!-- # Number: 0, 1. 0 - Off, 1 - On -->
-<!-- # Mandatory -->
 {if isset($grandstream_bluetooth_handsfree)}
 <P2911>{$grandstream_bluetooth_handsfree}</P2911>
-{else}
-<P2911>0</P2911>
 {/if}
 
 <!-- # Bluetooth Name. -->
 <!-- # String -->
 <!-- #P8364 = -->
 
-<!-- ############################################################################## -->
-<!-- ## Network/OpenVPN Settings                     ## -->
-<!-- ############################################################################## -->
-<!-- # OpenVPN Enable.  0 - No, 1 - Yes. Default is 1 -->
-<!-- #Number: 0, 1  -->
-<!-- #Mandatory -->
-<P7050>0</P7050>
-
-<!-- # OpenVPN Server Address -->
-<!-- # String -->
-<P7051></P7051>
-
-<!-- # OpenVPN Port. Default is 1194 -->
-<!-- # Number -->
-<!-- # Mandatory -->
-<P7052>1194</P7052>
-
-<!-- # OpenVPN Transport.  0 - UDP, 1 - TCP. Default is 0 -->
-<!-- #Number: 0, 1  -->
-<!-- #Mandatory -->
-<P2912>0</P2912>
-
-<!-- # OpenVPN CA -->
-<!-- # String -->
-<P9902></P9902>
-
-<!-- # OpenVPN Certificate -->
-<!-- # String -->
-<P9903></P9903>
-
-<!-- # OpenVPN Client Key -->
-<!-- # String -->
-<P9904></P9904>
-
-<!-- # OpenVPN Cipher Method. 0 - Blowfish, 1 - AES-128, 2 - AES-256, 3 - Triple-DES. Default is 0 -->
-<!-- # Number: 0, 1, 2, 3  -->
-<!-- # Mandatory -->
-<P8396>0</P8396>
-
-<!-- # OpenVPN Username -->
-<!-- # String -->
-<P8394></P8394>
-
-<!-- # OpenVPN Password -->
-<!-- # String -->
-<P8395></P8395>
-
 <!-- ############################################################################## -->
 <!-- ##  Maintenance/ Web Access     ## -->
 <!-- ############################################################################## -->
@@ -5409,34 +4489,28 @@
 <!-- # 1 - Check New Firmware only when F/W pre/suffix changes -->
 <!-- # 2 - Always Skip the Firmware Check -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P238>0</P238>
 
 <!-- # Always Authenticate Before Challenge. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P20713>0</P20713>
 
 <!-- # Allow DHCP Option 43 and Option 66 to override server. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # When set to Yes(1), it will override the configured provision path and method -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P145>1</P145>
 
 <!-- # Additional Override DHCP Option. 0 - None,  1 - Option 150,  2 - Option 160. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P8337>0</P8337>
 
 <!-- # Allow DHCP Option 120 to Override SIP Server -->
 <!-- # 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1411>0</P1411>
 
 <!-- # 3CX Auto Provision. 0 - No, 1 - Yes. Default is Yes -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1414>1</P1414>
 
 <!-- # Automatic Upgrade.  -->
@@ -5446,12 +4520,10 @@
 <!-- # 3 - Yes, check for upgrade based on Day of Week setting, -->
 <!-- # Default is No -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 <P194>1</P194>
 
 <!-- # Check for new firmware every () minutes. Default is 7 days. -->
 <!-- # Number: 60-86400 -->
-<!-- # Mandatory -->
 <P193>60</P193>
 
 <!-- # Hour of the Day (0-23). Default is 1 -->
@@ -5464,13 +4536,11 @@
 
 <!-- # Disable SIP NOTIFY Authentication. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0,1 -->
-<!-- # Mandatory -->
 <P4428>0</P4428>
 
 <!-- #Config -->
 <!-- # Config Via. 0 - TFTP,  1 - HTTP, 2 - HTTPS. Default is 2 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P212>2</P212>
 
 <!-- # Config Server Path -->
@@ -5505,13 +4575,11 @@
 
 <!-- # Authenticate Conf File. 0 - No, 1 - Yes. Default is No -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P240>0</P240>
 
 <!-- # Firmware -->
 <!-- # Firmware Upgrade Via. 0 - TFTP,  1 - HTTP, 2 - HTTPS. Default is 2 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P6767>2</P6767>
 
 <!-- # Firmware Server Path -->
@@ -5545,7 +4613,6 @@
 <!-- ############################################################################## -->
 <!-- # Syslog Protocol. 0 - UDP, 1 - SSL/TLS. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8402>0</P8402>
 
 <!-- # Syslog Server (name of the server, max length is 64 characters) -->
@@ -5554,7 +4621,6 @@
 
 <!-- # Syslog Level. 0 - NONE, 1 - DEBUG, 2 - INFO, 3 - WARNING, 4 - ERROR. Default is 0 -->
 <!-- # Number: 0, 1 , 2, 3, 4 -->
-<!-- # Mandatory -->
 {if isset($grandstream_syslog_level)}
 <P208>{$grandstream_syslog_level}</P208>
 {else}
@@ -5567,7 +4633,6 @@
 
 <!-- # Send SIP Log. 0 - Do not send SIP log in Syslog, 1 - Send SIP log in Syslog if configured and set to DEBUG level. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($grandstream_send_sip_log)}
 <P1387>{$grandstream_send_sip_log}</P1387>
 {else}
@@ -5576,17 +4641,14 @@
 
 <!-- # Show Internet Down Message. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8370>0</P8370>
 
 <!-- # Auto recover from abnormal. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1438>1</P1438>
 
 <!-- # USB Console Log. 0 - No, 1 - Yes. Default is 0 (for GXP2140/2160/2170 only) -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2922>0</P2922>
 
 <!-- ############################################################################## -->
@@ -5602,7 +4664,6 @@
 <!-- # zh-tw - traditional chinese, zh - simplified chinese, auto - Automatic -->
 <!-- # gxp - Downloaded Language -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P1362>Auto</P1362>
 
 <!-- # Default Input Selection. Default is Multi-Tap. -->
@@ -5611,59 +4672,13 @@
 
 <!-- # Auto language download. 0 - Yes, 1 - No. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2961>0</P2961>
 
-<!-- ############################################################################## -->
-<!-- ##  Maintenance/TR-069 -->
-<!-- ############################################################################## -->
-<!-- # ACS URL -->
-<!-- # String -->
-<!-- # P4503 = -->
-
-<!-- # TR-069 Username -->
-<!-- # String -->
-<P4504></P4504>
-
-<!-- # TR-069 Password -->
-<!-- # String -->
-<P4505></P4505>
-
-<!-- # Periodic Inform Enable. 0 - No, 1 - Yes. Default is 0 -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P4506>0</P4506>
-
-<!-- # Periodic Inform Interval. Default is 86400. -->
-<!-- # Number -->
-<P4507>86400</P4507>
-
-<!-- # Connection Request Username	 -->
-<!-- # String: a-z, A-Z, 0-9 -->
-<P4511></P4511>
-
-<!-- # Connection Request Password	 -->
-<!-- # String: a-z, A-Z, 0-9 -->
-<P4512></P4512>
-
-<!-- # Connection Request Port. Default is 7547. -->
-<!-- # Number -->
-<P4518>7547</P4518>
-
-<!-- # CPE SSL Certificate -->
-<!-- # String: a-z, A-Z, 0-9 -->
-<P8220></P8220>
-
-<!-- # CPE SSL Private Key -->
-<!-- # String: a-z, A-Z, 0-9 -->
-<P8221></P8221>
-
 <!-- ############################################################################## -->
 <!-- ##  Maintenance/Security Settings/Security   ## -->
 <!-- ############################################################################## -->
 <!-- # Configuration Via Keypad Menu. 0 - Unrestricted, 1 - Basic settings only, 2 - Constraint mode, 3 - Locked Mode. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 <P1357>0</P1357>
 
 <!-- # SIP TLS Certificate -->
@@ -5680,17 +4695,14 @@
 
 <!-- # Web Access Mode. 0 - HTTPS, 1 - HTTP, 2 - Disabled. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1650>1</P1650>
 
 <!-- # HTTP Web Port. Default is 80 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P22120>80</P22120>
 
 <!-- # HTTPS Web Port. Default is 443 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P22121>443</P22121>
 
 <!-- # Disable SSH. 0 - No, 1 - Yes. Default is 0 -->
@@ -5733,12 +4745,10 @@
 <!-- ############################################################################## -->
 <!-- # Enable Keypad Locking. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1382>0</P1382>
 
 <!-- # Keypad Lock Type. 0 - All Keys, 1 - Functional Keys. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8383>0</P8383>
 
 <!-- # Password to Lock/Unlock -->
@@ -5747,7 +4757,6 @@
 
 <!-- # Keypad Lock Timer. Default is 0 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P8384>0</P8384>
 
 <!-- # Emergency -->
@@ -5759,12 +4768,10 @@
 <!-- ############################################################################## -->
 <!-- # With RTP Packets. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P6007>0</P6007>
 
 <!-- # Capture Location. 0 - Internal Storage, 1 - USB. Default is 0 (GXP2140/2160/GXP2170 only) -->
 <!-- # Number: 0, 1. -->
-<!-- # Mandatory -->
 <P2999>0</P2999>
 
 <!-- # USB Filename (GXP2140/2160/GXP2170 only) -->
@@ -5776,7 +4783,6 @@
 <!-- ############################################################################## -->
 <!-- # Enable Phonebook XML Download. # 0 - Disabled, 1 - Enabled, use HTTP, 2 - Enabled, use TFTP, 3 - Enabled, use HTTPS. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3 -->
-<!-- # Mandatory -->
 {if isset($contact_grandstream)}
 <P330>1</P330>
 {else}
@@ -5814,17 +4820,14 @@
 
 <!-- # Remove Manually-edited entries on Download. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P333>1</P333>
 
 <!-- # Sort Phonebook by. 0 - Last Name, 1 - First Name. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2914>0</P2914>
 
 <!-- # Phonebook Key Function. 0 - Default, 1 - LDAP Search, 2 - Local Phonebook, 3 - Local Group, 4 - Broadsoft Phonebook -->
 <!-- # Number: 0, 1, 2, 3, 4. -->
-<!-- # Mandatory -->
 {if isset($contact_grandstream)}
 <P1526>2</P1526>
 {else}
@@ -5833,7 +4836,6 @@
 
 <!-- # Default search mode. 0 - Quick match, 1 - Exact match. Default is 0 -->
 <!-- # Number: 0, 1. -->
-<!-- # Mandatory -->
 <P2970>0</P2970>
 
 <!-- ############################################################################## -->
@@ -5841,7 +4843,6 @@
 <!-- ############################################################################## -->
 <!-- #LDAP protocol. 0 - LDAP, 1 - LDAPS -->
 <!-- #Number: 0,1 -->
-<!-- #Mandatory -->
 <P8037>0</P8037>
 
 <!-- # LDAP Server Address, up to 256 characters can be used. It can be IP address or Domain name -->
@@ -5878,7 +4879,6 @@
 
 <!-- # LDAP Version. Protocol version for the phone when send the bind requests -->
 <!-- # 2 - version 2, 3 - version 3. Default is 3 -->
-<!-- # Mandatory -->
 <P8027>3</P8027>
 
 <!-- # LDAP Name Attributes. This setting specifies the "name" attributes of each record which are returned in the LDAP search result -->
@@ -5898,18 +4898,15 @@
 <!-- # Max Hits. The setting specifies the maximum number of results to be returned by the LDAP server -->
 <!-- # If the value is set to 0, server will return all search results. Default is 50 -->
 <!-- # Number: 0 - 32000 -->
-<!-- # Mandatory -->
 <P8031>50</P8031>
 
 <!-- # Search Timeout (in seconds). Default is 30 -->
 <!-- # The setting specifies how long the server should process the request and client waits for server to return -->
 <!-- # Number: 0 - 180 -->
-<!-- # Mandatory -->
 <P8032>30</P8032>
 
 <!-- # Sort Results. This setting is used for sorting searching result. Default is 0 -->
 <!-- # Number: 0, 1. 0 - No, 1 - Yes. Default is 0 -->
-<!-- # Mandatory -->
 <P8033>0</P8033>
 
 <!-- # LDAP Lookup -->
@@ -5928,12 +4925,10 @@
 <!-- ############################################################################## -->
 <!-- # Local RTP port. Default is 5004 -->
 <!-- # Number: 1024 - 65400. Must be even number -->
-<!-- # Mandatory -->
 <P39>5004</P39>
 
 <!-- # Local RTP port range. Default is 200 -->
 <!-- # Number: 48 - 10000 -->
-<!-- # Mandatory -->
 <P29610>200</P29610>
 
 <!--  Max Local RTP Port. Default is 5204. -->
@@ -5943,12 +4938,10 @@
 
 <!-- # Use Random Port. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P78>0</P78>
 
 <!-- # Keep-Alive Interval (in seconds). Default is 20 -->
 <!-- # Number: 10 - 160 -->
-<!-- # Mandatory -->
 <P84>20</P84>
 
 <!-- # Use NAT IP. This will enable our SIP client to use this IP in the SIP/SDP message. Example 64.3.153.50 -->
@@ -5961,7 +4954,6 @@
 
 <!-- # Public Mode. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($public_mode) }
 	{if $public_mode|strtolower == 'true'}
 		<P1345>1</P1345>
@@ -5978,189 +4970,8 @@
 
 <!-- # Delay Registration. Default is 0. -->
 <!-- # Number: 0 - 90 -->
-<!-- # Mandatory -->
 <P8359>0</P8359>
 
-<!-- ############################################################################## -->
-<!-- ##  Settings/Broadsoft -->
-<!-- ############################################################################## -->
-<!-- ################################################################### -->
-<!-- # Broadsoft XSI -->
-<!-- ################################################################### -->
-<!-- # XSI -->
-<!-- # Server address -->
-<!-- # String -->
-<P1591> </P1591>
-
-<!-- # Port -->
-<!-- # Number -->
-<P1592> </P1592>
-
-<!-- # XSI Actions Path -->
-<!-- # String -->
-<P2937></P2937>
-
-<!-- # Broadsoft Contact Download Interval. Default is 0. If set to 0, automatic download will be disabled. Valid range is 5 to 720.  -->
-<!-- # Number: 5 - 720 -->
-<!-- # Mandatory -->
-<P8362>0</P8362>
-
-<!-- # XSI Authentication Type. 0 - Login Credentials, 1 - SIP Credentials, 2 - Account 1, 3 - Account 2, 4 - Account 3, 5 - Account 4, 6 - Account 5, 7 - Account 6.  -->
-<!-- # Number: 0,1,2,3,4,5,6,7.Default is 0. -->
-<!-- # Mandatory -->
-<P22054>0</P22054>
-
-<!-- # Login Credentials -->
-<!-- # Login Username -->
-<!-- # String -->
-<P1593></P1593>
-
-<!-- # Login Password -->
-<!-- # String -->
-<P1594></P1594>
-
-<!-- # SIP Credentials -->
-<!-- # SIP UserName  -->
-<!-- # String -->
-<P6772></P6772>
-
-<!-- # SIP User ID -->
-<!-- # String -->
-<P22034></P22034>
-
-<!-- # SIP Password  -->
-<!-- # String -->
-<P6773></P6773>
-
-<!-- # Sort Phonebook by. 0 - Last Name, 1 - First Name. Defaut is 0. -->
-<!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P22131>0</P22131>
-
-<!-- ###################################################################################### -->
-<!-- # Network Directories -->
-<!-- ###################################################################################### -->
-<!-- ### Group Directory ### -->
-<!-- # Disabled/Enabled. 0 - Disabled, 1 - Enabled. -->
-<!-- # Number: 0, 1. Default is 0 -->
-<!-- # Mandatory -->
-<P2971>0</P2971>
-
-<!-- # Name.  -->
-<!-- # String -->
-<P2972></P2972>
-
-<!-- ### Enterprise Directory ### -->
-<!-- # Disabled/Enabled. 0 - Disabled, 1 - Enabled. -->
-<!-- # Number: 0, 1. Default is 0 -->
-<!-- # Mandatory -->
-<P2973>0</P2973>
-
-<!-- # Name.  -->
-<!-- # String -->
-<P2974></P2974>
-
-<!-- ### Group Common ### -->
-<!-- # Disabled/Enabled. 0 - Disabled, 1 - Enabled. -->
-<!-- # Number: 0, 1. Default is 0 -->
-<!-- # Mandatory -->
-<P2975>0</P2975>
-
-<!-- # Name.  -->
-<!-- # String -->
-<P2976></P2976>
-
-<!-- ### Enterprise Common ### -->
-<!-- # Disabled/Enabled. 0 - Disabled, 1 - Enabled. -->
-<!-- # Number: 0, 1. Default is 0 -->
-<!-- # Mandatory -->
-<P2977>0</P2977>
-
-<!-- # Name.  -->
-<!-- # String -->
-<P2978></P2978>
-
-<!-- ### Personal Directory ### -->
-<!-- # Disabled/Enabled. 0 - Disabled, 1 - Enabled. -->
-<!-- # Number: 0, 1. Default is 0 -->
-<!-- # Mandatory -->
-<P2979>0</P2979>
-
-<!-- # Name.  -->
-<!-- # String -->
-<P2980></P2980>
-
-<!-- ### Missed Call Log ###  -->
-<!-- # Disabled/Enabled. 0 - Disabled, 1 - Enabled. -->
-<!-- # Number: 0, 1. Default is 0 -->
-<!-- # Mandatory -->
-<P2981>0</P2981>
-
-<!-- # Name.  -->
-<!-- # String -->
-<P2982></P2982>
-
-<!-- ### Placed Call Log ###  -->
-<!-- # Disabled/Enabled. 0 - Disabled, 1 - Enabled. -->
-<!-- # Number: 0, 1. Default is 0 -->
-<!-- # Mandatory -->
-<P2983>0</P2983>
-
-<!-- # Name.  -->
-<!-- # String -->
-<P2984></P2984>
-
-<!-- ### Received Call Log ###  -->
-<!-- # Disabled/Enabled. 0 - Disabled, 1 - Enabled. -->
-<!-- # Number: 0, 1. Default is 0 -->
-<!-- # Mandatory -->
-<P2985>0</P2985>
-
-<!-- # Name.  -->
-<!-- # String -->
-<P2986></P2986>
-
-<!-- ############################################################################## -->
-<!-- ##  Phonebook/Broadsoft Instant Message and Presence -->
-<!-- ############################################################################## -->
-<!-- # Login Credentials  -->
-<!-- # Server. -->
-<!-- # String -->
-<P6006></P6006>
-
-<!-- # Port.  -->
-<!-- # String -->
-<P6005></P6005>
-
-<!-- # Username.  -->
-<!-- # String -->
-<P2966></P2966>
-
-<!-- # Password.  -->
-<!-- # String -->
-<P2967></P2967>
-
-<!-- # IM&P Settings  -->
-<!-- # Broadsoft IM&P. Default is 0. -->
-<!-- # Number: 0,1. 1 - Enabled, 0 - Disabled -->
-<!-- # Mandatory -->
-<P2964>0</P2964>
-
-<!-- # Associated Broadsoft Account. Default is 0. -->
-<!-- # Number: 0 - 5 : Account 1 - Account 6 -->
-<!-- # Mandatory -->
-<P2965>0</P2965>
-
-<!-- # Auto Login. Default is 0. -->
-<!-- # 0 - No, 1 - Yes -->
-<!-- # Mandatory -->
-<P2968>0</P2968>
-
-<!-- # Display Non XMPP Contacts. Default is 0. -->
-<!-- # 0 - No, 1 - Yes -->
-<!-- # Mandatory -->
-<P2969>0</P2969>
-
 <!-- ############################################################################## -->
 <!-- ##  Settings/External Service -->
 <!-- ############################################################################## -->
@@ -6176,7 +4987,6 @@
 <!-- # Account -->
 <!-- # 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4(For GXP2140/2160/2170 only), 4 - Account 5(For GXP2160/2170 only), 5 - Account 6(For GXP2160/2170 only).  -->
 <!-- # Number: 0, 1, 2, 3, 4, 5. Default is 0. -->
-<!-- # Mandatory -->
 <P32001>0</P32001>
 
 <!-- # System Identification -->
@@ -6202,7 +5012,6 @@
 <!-- # Account -->
 <!-- # 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4(For GXP2140/2160/2170 only), 4 - Account 5(For GXP2160/2170 only), 5 - Account 6(For GXP2160/2170 only).  -->
 <!-- # Number: 0, 1, 2, 3, 4, 5. Default is 0. -->
-<!-- # Mandatory -->
 <P32006>0</P32006>
 
 <!-- # System Identification -->
@@ -6228,7 +5037,6 @@
 <!-- # Account -->
 <!-- # 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4(For GXP2140/2160/2170 only), 4 - Account 5(For GXP2160/2170 only), 5 - Account 6(For GXP2160/2170 only).  -->
 <!-- # Number: 0, 1, 2, 3, 4, 5. Default is 0. -->
-<!-- # Mandatory -->
 <P32011>0</P32011>
 
 <!-- # System Identification -->
@@ -6254,7 +5062,6 @@
 <!-- # Account -->
 <!-- # 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4(For GXP2140/2160/2170 only), 4 - Account 5(For GXP2160/2170 only), 5 - Account 6(For GXP2160/2170 only).  -->
 <!-- # Number: 0, 1, 2, 3, 4, 5. Default is 0. -->
-<!-- # Mandatory -->
 <P32016>0</P32016>
 
 <!-- # System Identification -->
@@ -6280,7 +5087,6 @@
 <!-- # Account -->
 <!-- # 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4(For GXP2140/2160/2170 only), 4 - Account 5(For GXP2160/2170 only), 5 - Account 6(For GXP2160/2170 only).  -->
 <!-- # Number: 0, 1, 2, 3, 4, 5. Default is 0. -->
-<!-- # Mandatory -->
 <P32021>0</P32021>
 
 <!-- # System Identification -->
@@ -6306,7 +5112,6 @@
 <!-- # Account -->
 <!-- # 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4(For GXP2140/2160/2170 only), 4 - Account 5(For GXP2160/2170 only), 5 - Account 6(For GXP2160/2170 only).  -->
 <!-- # Number: 0, 1, 2, 3, 4, 5. Default is 0. -->
-<!-- # Mandatory -->
 <P32026>0</P32026>
 
 <!-- # System Identification -->
@@ -6332,7 +5137,6 @@
 <!-- # Account -->
 <!-- # 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4(For GXP2140/2160/2170 only), 4 - Account 5(For GXP2160/2170 only), 5 - Account 6(For GXP2160/2170 only).  -->
 <!-- # Number: 0, 1, 2, 3, 4, 5. Default is 0. -->
-<!-- # Mandatory -->
 <P32031>0</P32031>
 
 <!-- # System Identification -->
@@ -6358,7 +5162,6 @@
 <!-- # Account -->
 <!-- # 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4(For GXP2140/2160/2170 only), 4 - Account 5(For GXP2160/2170 only), 5 - Account 6(For GXP2160/2170 only).  -->
 <!-- # Number: 0, 1, 2, 3, 4, 5. Default is 0. -->
-<!-- # Mandatory -->
 <P32036>0</P32036>
 
 <!-- # System Identification -->
@@ -6384,7 +5187,6 @@
 <!-- # Account -->
 <!-- # 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4(For GXP2140/2160/2170 only), 4 - Account 5(For GXP2160/2170 only), 5 - Account 6(For GXP2160/2170 only).  -->
 <!-- # Number: 0, 1, 2, 3, 4, 5. Default is 0. -->
-<!-- # Mandatory -->
 <P32041>0</P32041>
 
 <!-- # System Identification -->
@@ -6410,7 +5212,6 @@
 <!-- # Account -->
 <!-- # 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4(For GXP2140/2160/2170 only), 4 - Account 5(For GXP2160/2170 only), 5 - Account 6(For GXP2160/2170 only).  -->
 <!-- # Number: 0, 1, 2, 3, 4, 5. Default is 0. -->
-<!-- # Mandatory -->
 <P32046>0</P32046>
 
 <!-- # System Identification -->
@@ -6431,17 +5232,14 @@
 <!-- # Preferred Default Account.  -->
 <!-- # 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4(For GXP2140/2160/2170 only), 4 - Account 5(For GXP2160/2170 only), 5 - Account 6(For GXP2160/2170 only).  -->
 <!-- # Number: 0, 1, 2, 3, 4, 5. Default is 0. -->
-<!-- # Mandatory -->
 <P29612>0</P29612>
 
 <!-- # Predictive Dialing Feature. 0 - Disabled, 1 - Enabled. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P22126>1</P22126>
 
 <!-- # Onhook Dial Barging. 0 - Disabled, 1 - Enabled. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8397>1</P8397>
 
 <!-- # Off-hook Auto Dial -->
@@ -6454,97 +5252,87 @@
 
 <!-- # Off-hook Timeout (in seconds). Default is 30 -->
 <!-- # Number: 10 - 60 -->
-<!-- # Mandatory -->
 <P1485>30</P1485>
 
 <!-- # Enable Live DialPad. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8350>0</P8350>
 
 <!-- # Live DialPad Expire Time. Default is 5 -->
 <!-- # Number: 2 - 15.  -->
-<!-- # Mandatory -->
 <P8351>5</P8351>
 
 <!-- # Enable Automatic Redial. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8353>0</P8353>
 
 <!-- # Automatic Redial Times. Default is 10 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P8354>10</P8354>
 
 <!-- # Automatic Redial Interval. Default is 20 -->
 <!-- # Number -->
-<!-- # Mandatory -->
 <P8355>20</P8355>
 
 <!-- # Bypass Dial Plan Through Call History and Directories. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P6758>0</P6758>
 
 <!-- # Disable Call Waiting. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P91>0</P91>
+{if isset{$grandstream_call_waiting}}
+{if $grandstream_call_waiting == "1"}<P91>0</P91>{/if}
+{if $grandstream_call_waiting == "2"}<P91>1</P91>{/if}
+{/if}
 
 <!-- # Disable Call Waiting Tone. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P186>0</P186>
+{if isset{$grandstream_call_waiting}}
+{if $grandstream_call_waiting == "1"}<P186>0</P186>{/if}
+{if $grandstream_call_waiting == "2"}<P186>1</P186>{/if}
+{/if}
 
 <!-- # Ring for Call Waiting. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
-<P22102>0</P22102>
+{if isset{$grandstream_call_waiting}}
+{if $grandstream_call_waiting == "1"}<P22102>0</P22102>{/if}
+{if $grandstream_call_waiting == "2"}<P22102>1</P22102>{/if}
+{/if}
 
 <!-- # Disable Busy Tone on Remote Disconnect. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P6762>0</P6762>
 
 <!-- # Disable Direct IP Call. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1310>0</P1310>
 
 <!-- # Use Quick IP call mode. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P184>0</P184>
 
 <!-- # Disable Conference. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1311>0</P1311>
 
 <!-- # Disable in-call DTMF display. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P338>0</P338>
 
 <!-- # Enable Sending DTMF via specific MPKs. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1339>0</P1339>
 
 <!-- # Mute Key Functions While Idle. 0 - DND, 1 - Idle Mute, 2 - Disabled. Default is 0 -->
 <!-- # Number: 0,1,2 -->
-<!-- # Mandatory -->
 <P1565>0</P1565>
 
 <!-- # DND Override. 0 - Off, 1 - Allow All, 2 - Allow Only Contacts, 3 - Allow Only Favourites. Default is 0 -->
 <!-- # Number: 0,1,2,3 -->
-<!-- # Mandatory -->
 <P8372>0</P8372>
 
 <!-- # Disable Transfer. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1341>0</P1341>
 
 <!-- # In-call Dial Number on pressing transfer key -->
@@ -6553,7 +5341,6 @@
 
 <!-- # Attended Transfer Mode. 0 - Static, 1 - Dynamic. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($grandstream_auto_attended_transfer) }
 <P1376>{$grandstream_auto_attended_transfer}</P1376>
 {else}
@@ -6562,47 +5349,38 @@
 
 <!-- # Transfer Mode Via VPK. 0 - Blind Transfer, 1 - Attended Transfer, 2 - New Call. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8390>0</P8390>
 
 <!-- # Do not Escape '#' as 23% in SIP URL. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1406>0</P1406>
 
 <!-- # Click-To-Dial Feature. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1561>0</P1561>
 
 <!-- # Default call log type. 0 - Default, 1 - Broadsoft Call Log, 2 - Local Call Log. -->
 <!-- # Number: 0,1,2. Default is 0. -->
-<!-- # Mandatory -->
 <P6765>0</P6765>
 
 <!-- # Return Code When Refusing Incoming Call. Default is 0 -->
 <!-- # Number: 0,1,2,3. 0 - Busy, 1 - Temporarily Unavailable, 2 - Not Found(404), 3 - Decline(603). -->
-<!-- # Mandatory -->
 <P8360>0</P8360>
 
 <!-- # Return Code When Enable DND. Default is 0 -->
 <!-- # Number: 0,1,2,3. 0 - Busy, 1 - Temporarily Unavailable, 2 - Not Found(404), 3 - Decline(603). -->
-<!-- # Mandatory -->
 <P8361>0</P8361>
 
 <!-- # Enable BLF Pickup Screen.  0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P9905>0</P9905>
 
 <!-- # Enable BLF Pickup Sound.  0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P9906>0</P9906>
 
 <!-- # Enable BLF Pickup Sound List. 0 - Except List, 1 - Only List. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P9907>0</P9907>
 
 <!-- # BLF Pickup Sound Except List.  -->
@@ -6615,22 +5393,18 @@
 
 <!-- # Local Call Recording Feature. 0 - Disable, 1 - Enable. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P6760>0</P6760>
 
 <!-- # Saved Local Call Recording Location. 0 - Internal Storage 1 - USB. Default is 0. For GXP2140/2160/2170 only -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P6761>0</P6761>
 
 <!-- # Instant Message Popup Timeout -->
 <!-- # Number: 10 - 900 -->
-<!-- # Mandatory -->
 <P26055>10</P26055>
 
 <!-- # Play Tone On Receiving IM. 0 - Disable, 1 - Enable. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P26056>0</P26056>
 
 <!-- # User-Agent Prefix -->
@@ -6640,27 +5414,22 @@
 <!-- # Auto Provision List Starting Point. 0 - Extension Boards, 1 - VPK, 2 - MPK. -->
 <!-- # For GXP2140/GXP2170 Number: 0, 1. Default is 0 -->
 <!-- # For GXP2130/GXP2160 Number: 1, 2. Default is 1 -->
-<!-- # Mandatory -->
 <!-- #P8349 = 0 -->
 <!--   -->
 <!-- # Hide BLF Remote Status. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8374>0</P8374>
 
 <!-- # Show SIP Error Response. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8376>1</P8376>
 
 <!-- # Enable Missed Call Notification. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8393>0</P8393>
 
 <!-- # Enable Call Completion Service. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8391>0</P8391>
 
 <!-- ############################################################################## -->
@@ -6672,24 +5441,20 @@
 <!-- ############################################################################## -->
 <!-- # Allowed in DND Mode. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8381>0</P8381>
 
 <!-- # Paging Barge. 0 - Disable, 1 - priority 1, 2 - priority 2, 3 - priority 3,  -->
 <!-- # 4 - priority 4, 5 - priority 5, 6 - priority 6, 7 - priority 7, 8 - priority 8, -->
 <!-- # 9 - priority 9, 10 - priority 10. Default is 0. -->
 <!-- # Number: 0 - 10 -->
-<!-- # Mandatory -->
 <P1566>0</P1566>
 
 <!-- # Paging Priority Active. 0 - Disabled, 1 - Enabled -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1567>0</P1567>
 
 <!-- # Multicast Paging Codec. 18 - G.729A/B, 0 - PCMU, 8 - PCMA, 2 - G.726-32, 9 - G.722, 98 - iLBC, 4- G.723.1 -->
 <!-- # Number: 18, 0, 8, 2, 9, 98, 4. Default is 0. -->
-<!-- # Mandatory -->
 <P1568>0</P1568>
 
 <!-- ### Multicast Listening ###  -->
@@ -6877,37 +5642,30 @@
 <!-- ############################################################################## -->
 <!-- # HEADSET Key Mode. 0 - Default Mode, 1 - Toggle Headset/Speaker. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1312>0</P1312>
 
 <!-- # Headset Type. 0 - Normal, 1 - Plantronics EHS. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P6779>0</P6779>
 
 <!-- # EHS Headset Ring Tone. 0 - Normal, 1 - Plantronics EHS. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1487>0</P1487>
 
 <!-- # Always Ring Speaker. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1439>0</P1439>
 
 <!-- # Headset TX gain(db). 1 - -6, 0 - 0, 2 - +6. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P1301>0</P1301>
 
 <!-- # Headset RX gain(db). 1 - -6, 0 - 0, 2 - +6. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P1302>0</P1302>
 
 <!-- # Handset TX gain(db). 1 - -6, 0 - 0, 2 - +6. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P1464>0</P1464>
 
 <!-- ############################################################################## -->
@@ -6926,7 +5684,7 @@
 {if isset($ntp_server_secondary)}
 <P8333>{$ntp_server_secondary}</P8333>
 {else}
-<P8333></P8333>
+<P8333>2.us.pool.ntp.org</P8333>
 {/if}
 
 <!-- # NTP Update Interval -->
@@ -6937,7 +5695,6 @@
 <!-- # Allow DHCP Option 42 to override NTP server. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # When set to Yes(1), it will override the configured NTP server -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P144>1</P144>
 
 <!-- # Time Zone -->
@@ -7003,7 +5760,6 @@
 <!-- # customize                                                                                          Self-Defined Time Zone -->
 
 <!-- # String -->
-<!-- # Mandatory -->
 {if isset($grandstream_timezone) }
 <P64>{$grandstream_timezone}</P64>
 {elseif isset($grandstream_gxp_time_zone) }
@@ -7015,13 +5771,11 @@
 <!-- # Allow DHCP Option 2 to override Time Zone setting. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # When set to Yes(1), it will override the configured Time Zone setting if available  -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P143>1</P143>
 
 <!-- # Self Defined Time zone. Max length allowed is 64 characters -->
 <!-- # String -->
-<!-- # Mandatory -->
-<P246>MTZ+6MDT+5,M4.1.0,M11.1.0</P246>
+<!-- <P246>MTZ+6MDT+5,M4.1.0,M11.1.0</P246> -->
 
 <!-- # Date Display Format -->
 <!-- # 0: yyyy-mm-dd      eg. 2011-10-31 -->
@@ -7030,17 +5784,14 @@
 <!-- # 3: dddd, MMMM dd   eg. Monday, October 31 -->
 <!-- # 4: MMMM dd, dddd   eg. October 31, Monday -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
 <P102>3</P102>
 
 <!-- # Time Display Format. 0 - 12 Hour, 1 - 24 Hour -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P122>0</P122>
 
 <!-- # Show Date On Status Bar. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8387>0</P8387>
 
 <!-- ############################################################################## -->
@@ -7049,29 +5800,24 @@
 <!-- # Backlight Brightness. -->
 <!-- # Active. Default is 100. -->
 <!-- # Number: 10 - 100 -->
-<!-- # Mandatory -->
 <P334>100</P334>
 
 <!-- # Idle. Default is 60. -->
 <!-- # Number: 0 - 100 -->
-<!-- # Mandatory -->
 <P335>60</P335>
 
 <!-- # Active Backlight Timeout. Default is 1 -->
 <!-- # Number: 1 - 90 -->
-<!-- # Mandatory -->
 <P8356>1</P8356>
 
 <!-- # Disable Missed Call Backlight. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P351>0</P351>
 
 
 <!-- # Wallpaper Settings -->
 <!-- # Wallpaper Source. 0 - Default, 1 - Download, 2-USB(for GXP2140/2160/2170 only), 3 - Uploaded, 4 - Color Background -->
 <!-- # Number: 0-4 -->
-<!-- # Mandatory -->
 <!-- <P2916>0</P2916> -->
 
 <!-- # Wallpaper Server Path -->
@@ -7090,7 +5836,6 @@
 
 <!-- # Screensaver Settings -->
 <!-- # Screensaver. 0 - No, 1 - Yes, 2 - On if no VPK is active. Default is 1 -->
-<!-- # Mandatory -->
 {if isset($grandstream_screensaver)}
 <P2918>{$grandstream_screensaver}</P2918>
 {else}
@@ -7099,7 +5844,6 @@
 
 <!-- # Screensaver Source.  0 - Default, 1 - USB, 2 - Download. Default is 0. For GXP2140/2160/2170 only -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 {if isset($grandstream_screensaver_source)}
 <P6759>{$grandstream_screensaver_source}</P6759>
 {else}
@@ -7108,7 +5852,6 @@
 
 <!-- # Show Date and Time. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($grandstream_screensaver_show_date_time)}
 <P8441>{$grandstream_screensaver_show_date_time}</P8441>
 {else}
@@ -7117,7 +5860,6 @@
 
 <!-- # Screensaver Timeout. Minutes. -->
 <!-- # Number: 3 - 60 -->
-<!-- # Mandatory -->
 {if isset($grandstream_screensaver_timeout)}
 <P2919>{$grandstream_screensaver_timeout}</P2919>
 {else}
@@ -7134,7 +5876,6 @@
 
 <!-- Screensaver XML Download Interval -->
 <!-- # Number: 5 - 720. Default is 0 (disable auto downloading) -->
-<!-- # Mandatory -->
 {if isset($grandstream_screensaver_xml_download_interval)}
 <P935>{$grandstream_screensaver_xml_download_interval}</P935>
 {else}
@@ -7146,12 +5887,10 @@
 <!-- ############################################################################## -->
 <!-- # BLF LED Pattern. 0 - Default, 1 - Analog, 2 - Directional, 3 - Reserved(Red), 4 - Reserved(Green), 5 - Inverse. Default is 0 -->
 <!-- # Number: 0 - 5  -->
-<!-- # Mandatory -->
 <P6766>0</P6766>
 
 <!-- # Disable VM/MSG power light flash. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8371>0</P8371>
 
 
@@ -7165,68 +5904,58 @@
 
 <!-- # System Ring Tone -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P345>f1=440,f2=480,c=200/400;</P345>
 
 <!-- # Dial Tone -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P343>f1=350,f2=440;</P343>
 
 <!-- # Second Dial Tone -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P2909>f1=350,f2=440;</P2909>
 
 <!-- # Message Waiting Tone -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P344>f1=350,f2=440,c=10/10;</P344>
 
 <!-- # Ring Back Tone -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P346>f1=440,f2=480,c=200/400;</P346>
 
 <!-- # Call-Waiting Tone -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P347>f1=440,f2=440,c=25/525;</P347>
 
 <!-- # Call-Waiting Tone Gain. 0 - Low, 1 - Medium, 2 - High. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P1555>0</P1555>
 
 <!-- # Busy Tone -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P348>f1=480,f2=620,c=50/50;</P348>
 
 <!-- # Reorder Tone -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P349>f1=480,f2=620,c=25/25;</P349>
 
 <!-- # Speaker Ring Volume -->
 <!-- # Number: 0-7. Default is 5. -->
-<!-- # Mandatory -->
 <!--<P8352>5</P8352>-->
 
 <!-- # Notification Tone Volume -->
 <!-- # Number: 0-7. Default is 5. -->
-<!-- # Mandatory -->
 <!--<P8399>5</P8399>-->
 
 <!-- # Lock Volumne. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8392>0</P8392>
 
 <!-- # Default Ringtone. 0 - system ring tone, 1 - custom ring tone 1, 2 - custom ring tone 2, 3 - custom ring tone 3, 4 - silent. Default is 0 -->
 <!-- # Number: 0, 1, 2, 3, 4 -->
-<!-- # Mandatory -->
-<P8398>0</P8398>
+<!-- FIXME with grandstream_default_ring_tone -->
+{if isset($grandstream_default_ringtone)}
+<P8398>{$grandstream_default_ringtone}</P8398>
+{/if}
 
 
 <!-- ############################################################################## -->
@@ -7236,52 +5965,43 @@
 
 <!-- # Use Auto Location Service. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8338>1</P8338>
 
 <!-- # Enable weather update. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1402>1</P1402>
 
 <!-- # City Code -->
 <!-- # 0 - Self-Defined City Code, 1 - Automatic. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 {if isset($grandstream_city_code)}
 <P1405>0</P1405>
-{else}
-<P1405>1</P1405>
 {/if}
 
 
 <!-- # Self-Defined City Code -->
 <!-- # String -->
+{if isset($grandstream_city_code)}
 <P1377>{$grandstream_city_code}</P1377>
+{/if}
 
 <!-- # Update Interval (in minutes). Default is 15 -->
 <!-- # Number: 5 - 360 -->
-<!-- # Mandatory -->
 <P1378>15</P1378>
 
 <!-- # Degree Unit. auto - Automatic, f - Fahrenheit, c - Celsius. Default is auto -->
 <!-- # String: auto, f, c -->
-<!-- # Mandatory -->
 {if isset ($grandstream_temp_unit)}
 <P1379>{$grandstream_temp_unit}</P1379>
-{else}
-<P1379>auto</P1379>
 {/if}
 
 <!-- # Currency Update -->
 <!-- # Enable Currency update. 0 - No, 1 - Yes. Default is 1 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P1404>1</P1404>
 
 <!-- # Currency Code -->
 <!-- # String -->
-<!-- # Mandatory -->
 <P1381>EUR/USD;GBP/USD;CAD/USD;AUD/USD;CNY/USD;JPY/USD</P1381>
 
 <!-- ############################################################################## -->
@@ -7301,7 +6021,6 @@
 
 <!-- # Block Call Screen. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8368>0</P8368>
 
 <!-- ############################################################################## -->
@@ -7313,28 +6032,23 @@
 <!-- # Idle Screen Settings -->
 <!-- # Show Label Background. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8345>0</P8345>
 
 <!-- # Use Long Label. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8346>0</P8346>
 
 <!-- # Call Screen Settings -->
 <!-- # Key Mode. 1 - Line Mode, 2 - Account Mode. Default is 1 -->
 <!-- # Number: 1, 2 -->
-<!-- # Mandatory -->
 <P8369>1</P8369>
 
 <!-- # Show VPK Icon. 0 - No, 1 - Yes. Default is 0 (For GXP2140/2160/2170 only) -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2936>0</P2936>
 
 <!-- # Show Keys Label. 1 - Show, 2 - Hide, 0 - Toggle. Default is 0 -->
 <!-- # Number: 0, 1, 2 -->
-<!-- # Mandatory -->
 <P8386>0</P8386>
 
 <!-- ############################################################################## -->
@@ -7433,11 +6147,9 @@
 <!-- # 6 - Voice Mail, 7 - Call Return, 8 - Transfer, 9 - Call Park, 10 - Intercom -->
 <!-- # 11 - LDAP Search, 12 - Conference, 13 - Multicast Paging, 14 - Record, 15 - Call Log -->
 <!-- # 16 - Monitored Call Park, 17 - Menu 18- XML Application,19 - Information, 20 - Message -->
-<!-- # Mandatory -->
 <P{$start_id+$mem-1}>{$key_types[$keys.memory.$mem.device_key_type]}</P{$start_id+$mem-1}>
 <!-- # Account. 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4, 4 - Account 5, 5 - Account 6 -->
 <!-- # Number: 0, 1, 2, 3, 4, 5 -->
-<!-- # Mandatory -->
 <P{$start_id+$pid-22}>{$keys.memory.$mem.device_key_line}</P{$start_id+$pid-22}>
 <!-- # Name. Max length allowed is 128 characters. -->
 <!-- # String -->
@@ -7497,24 +6209,20 @@
 <!-- # More Softkey Display Mode -->
 <!-- # Number: 0, 1. Default is 0 -->
 <!-- # 0 - Menu, 1 - Toggle -->
-<!-- # Mandatory -->
 <P2934>0</P2934>
 
 <!-- # Show Target Softkey -->
 <!-- # Number: 0, 1. Default is 1 -->
 <!-- # 0 - No, 1 - Yes -->
-<!-- # Mandatory -->
 <P8377>1</P8377>
 
 <!-- # Softkey Layout -->
 <!-- # Custom Softkey Layout. 0 - Disabled, 1 - Enabled. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2923>0</P2923>
 
 <!-- # Enforce Softkey Layout Position. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P2924>0</P2924>
 
 <!-- # Hide System Softkey on Main Page.  -->
@@ -7572,7 +6280,6 @@
 <!-- # 0 - Default, 10 - Speed Dial, 14 - Speed Dial via active account, 16 - Voicemail,  -->
 <!-- # 17 - CallReturn, 20 - Intercom, 21 - LDAP Search, 25 - Call Log, 27 - Menu, 29 - Information, 30 - Message -->
 <!-- # Number: 0,10,14,16,17,20,21,25,27,29,30 -->
-<!-- # Mandatory -->
 
 
 {assign var=key_types value=["speed dial"=>10, "speed dial active"=>14,"voicemail"=>16,"call return"=>17,"intercom"=>20,"ldap search"=>21,"menu"=>27]}
@@ -7603,12 +6310,10 @@
 <!-- ######################################################################## -->
 <!-- # One Page Display Mode. 0 - No, 1 - Yes. -->
 <!-- # Number: 0, 1. Default is 0 -->
-<!-- # Mandatory -->
 <P8357>0</P8357>
 
 <!-- # Sync Backlight with LCD. 0 - No, 1 - Yes. Default is 0 -->
 <!-- # Number: 0, 1 -->
-<!-- # Mandatory -->
 <P8400>0</P8400>
 
 <!-- ###################################################################################### -->
@@ -7621,7 +6326,6 @@
 <!-- # 6 - Voice Mail, 7 - Call Return, 8 - Transfer, 9 - Call Park, 10 - Intercom -->
 <!-- # 11 - LDAP Search, 12 - Conference, 13 - Multicast Paging, 14 - Record, 15 - Call Log -->
 <!-- # 16 - Monitored Call Park, 17 - Menu 18- XML Application,19 - Information, 20 - Message -->
-<!-- # Mandatory -->
 <!-- <P23000>-1</P23000> -->
 
 <!-- # Account. 0 - Account 1, 1 - Account 2, 2 - Account 3, 3 - Account 4, 4 - Account 5, 5 - Account 6 -->