Yealink SIP-T2 SERIES Administrator's Manual page 757

Configuring Advanced Features
Details of Configuration Parameters:
Parameters Permitted Values Default
sip.nat_stun.enable 0 or 1 0
Description:
Enables or disables the STUN (Simple Traversal of UDP over NATs) feature on the IP
phone.
0-Disabled
1-Enabled
Note: If you change this parameter, the IP phone will reboot to make the change
take effect.
Web User Interface:
Network->Advanced->NAT->Active
Phone User Interface:
Menu->Settings->Advanced Settings (default password: admin)
->Network->NAT->NAT Status
IP address or
sip.nat_stun.server Blank
domain name
Description:
Configures the IP address or the domain name of the STUN (Simple Traversal of
UDP over NATs) server.
Example:
sip.nat_stun.server = 218.107.220.201
Note: If you change this parameter, the IP phone will reboot to make the change
take effect.
Web User Interface:
Network->Advanced->NAT->STUN Server
Phone User Interface:
Menu->Settings->Advanced Settings (default password: admin)
->Network->NAT->STUN Server
Integer from 1024 to
sip.nat_stun.port 3478
65000
Description:
Configures the port of the STUN (Simple Traversal of UDP over NATs) server.
Example:
735