AMX Modero NXD-700Vi Operation/Reference Manual page 207

Syntax:
^PHN-SETUP-
STUNADDR
"'^PHN-SETUP-STUNADDR, <IP>'"
Sets the IP
Variable:
address for the
IP = The IP address for the STUN server
STUN server.
Example:
SEND_COMMAND Panel,"'^PHN-SETUP-STUNADDR, 192.168.223.111'"
^PHN-SETUP- Syntax:
USERNAME
"'^PHN-SETUP-USERNAME, <username>'"
Sets the user
Variable:
name for
username = The user name (usually the phone extension)
authentication
with the proxy Example:
server.
SEND_COMMAND Panel,"'^PHN-SETUP-USERNAME, 6003'"