Yealink SIP-T48G Administrator's Manual page 462

Administrator's Guide for SIP-T2_Series_T4_Series IP Phones
Phone User Interface:
Menu->Settings->Advanced Settings (default password: admin)
->Network->NAT->STUN Server
sip.nat_stun.port
Description:
Configures the port of the STUN server.
Example:
sip.nat_stun.port = 3478
Web User Interface:
Network->Advanced->NAT->STUN Port
Phone User Interface:
Menu->Settings->Advanced Settings (default password: admin)
->Network->NAT->Port
To configure NAT traversal for account via web user interface::
1. Click on Account->Register.
2. Select the desired account from the pull-down list of Account.
3. Select STUN from the pull-down list of NAT.
448
Parameters Permitted Values
Integer from 1024 to
65000
Default
3478