Yealink SIP-T21 E2

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
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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->NAT->STUN->Active
Phone User Interface:
Menu->Advanced (default password: admin) ->Network->NAT->NAT Status
sip.nat_stun.server
IP address or
domain name
Blank
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: It works only if the value of the parameter “sip.nat_stun.enable” is set to 1 (Enabled).
If you change this parameter, the IP phone will reboot to make the change take effect.
Web User Interface:
Network->NAT->STUN->STUN Server
Phone User Interface:
Menu->Advanced (default password: admin) ->Network->NAT->STUN Server
sip.nat_stun.port
Integer from 1024
to 65000
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