Yealink SIP-T48G Administrator's Manual page 652

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Details of Configuration Parameters:
sip.nat_stun.enable
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
sip.nat_stun.server
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
632
Phone User Interface
Parameters
Configure NAT traversal and
STUN server on a phone basis.
Configure NAT traversal on a
per-line basis.
Permitted Values
0 or 1
IP address or
domain name
Default
0
Blank