Yealink SIP-T48G Administrator's Manual page 461

Configuring Advanced Features
Parameters Permitted Values Default
0-Disabled
1-STUN
Note: It works only if the value of the parameter "sip.nat_stun.enable" is set to 1
(Enabled).
X ranges from 1 to 16 (for SIP-T48G/T46G/T29G).
X ranges from 1 to 12 (for SIP-T42G).
X ranges from 1 to 6 (for SIP-T41P/T27P).
X ranges from 1 to 3 (for SIP-T23P/G).
X ranges from 1 to 2 (for SIP-T21(P) E2).
Web User Interface:
Account->Register->NAT
Phone User Interface:
None
sip.nat_stun.enable 0 or 1 0
Description:
Enables or disables STUN 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 server.
Example:
sip.nat_stun.server = 218.107.220.201
Web User Interface:
Network->Advanced->NAT->STUN Server
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