diff --git a/resources/templates/provision/grandstream/gxp21xxbk/{$mac}.xml b/resources/templates/provision/grandstream/gxp21xxbk/{$mac}.xml
index e95eecf5e1..9a465cc112 100644
--- a/resources/templates/provision/grandstream/gxp21xxbk/{$mac}.xml
+++ b/resources/templates/provision/grandstream/gxp21xxbk/{$mac}.xml
@@ -163,7 +163,7 @@
 <P81>0</P81>
 
 <!-- Register Expiration (in minutes). Default is 60. Max about 45 days -->
-<P32>3</P32>
+<P32>{$account.1.register_expires}</P32>
 
 <!-- Reregister Before Expiration (in seconds). Default is 0 second -->
 <P2330>0</P2330>
@@ -695,7 +695,7 @@
 <!-- Register Expiration (in minutes). Default is 60. Max is 45 days -->
 <!-- Number: 1 - 64800 -->
 <!-- Mandatory -->
-<P412>3</P412>
+<P412>{$account.2.register_expires}</P412>
 
 <!-- Reregister Before Expiration (in seconds). Default is 0 -->
 <!-- Number: 0 - 64800 -->
@@ -1246,7 +1246,7 @@
 <!-- Register Expiration (in minutes). Default is 60. Max is 45 days -->
 <!-- Number: 1 - 64800 -->
 <!-- Mandatory -->
-<P512>3</P512>
+<P512>{$account.3.register_expires}</P512>
 
 <!-- Reregister before Expiration (in seconds). Default is 0 second -->
 <!-- Number: 0 - 64800 -->
@@ -1796,7 +1796,7 @@
 <!-- Register Expiration (in minutes). Default is 60. Max is 45 days -->
 <!-- Number: 1 - 64800 -->
 <!-- Mandatory -->
-<P612>3</P612>
+<P612>{$account.4.register_expires}</P612>
 
 <!-- Reregister before Expiration (in seconds). Default is 0 -->
 <!-- Number: 0 - 64800 -->
@@ -2342,7 +2342,7 @@
 <!-- Register Expiration (in minutes. default 1 hour, max 45 days) -->
 <!-- Number: 1-64800 -->
 <!-- Mandatory -->
-<P1712>3</P1712>
+<P1712>{$account.5.register_expires}</P1712>
 
 <!-- Reregister before Expiration (in seconds) Default is 0 -->
 <!-- Number: 0 - 64800 -->
@@ -2891,7 +2891,7 @@
 <!-- Register Expiration (in minutes). Default is 60. Max is 45 days -->
 <!-- Number: 1 - 64800 -->
 <!-- Mandatory -->
-<P1812>3</P1812>
+<P1812>{$account.6.register_expires}</P1812>
 
 <!-- Reregister before Expiration (in seconds). Default is 0 -->
 <!-- Number: 1 - 64800 -->