Update the GXP Template
Add missing variables from version 1 p-code templates
grandstream_nat_traversal
options: No, STUN, KeepAlive, UPnP, Auto, VPN
grandstream_distinctive_ringtone_* (1-10)
grandstream_lan_port_vlan
Number: 0 - 4095
grandstream_pc_port_vlan
Number: 0 - 4095
grandstream_pc_mode
options: Enabled, Disabled, Mirrored
grandstream_stun_server
grandstream_headset_key_mode
options: DefaultMode, ToggleHeadsetOrSpeaker
grandstream_headset_ringtone
options: Normal, PlantronicsEHS
grandstream_headset_type
options: Normal, PlantronicsEHS
grandstream_headset_rx_gain
Headset RX gain(dB). 1 - -6, 0 - 0, 2 - +6. Default is 0
grandstream_headset_tx_gain
Handset TX gain(dB). 1 - -6, 0 - 0, 2 - +6. Default is 0
grandstream_screensaver_enable
options: No, Yes, OnIfNoVPKIsActive
grandstream_screensaver_source
options: Default, USB, Download
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