Yealink SIP-T21 E2

Setting Up Your System
107
Parameters
Permitted Values
Default
Description:
Configures the port of the STUN (Simple Traversal of UDP over NATs) server.
Example:
sip.nat_stun.port = 3478
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 Port (1024~65000)
Phone User Interface:
Menu->Advanced (default password: admin) ->Network->NAT->STUN Port
account.X.nat.nat_traversal
0, 1 or 2
0
Description:
Enables or disables the NAT traversal for account X.
0-Disabled
1-STUN
2-Manual NAT
X ranges from 1 to 16 (for SIP-T54S/T48G/T48S/T46G/T46S/T29G)
X ranges from 1 to 12 (for SIP-T52S/T42G/T42S)
X ranges from 1 to 6 (for SIP-T41P/T41S/T27P/T27G)
X ranges from 1 to 3 (for SIP-T40P/T40G/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860/CP920)
Note: If it is set to 1 (STUN), it works only if the value of the parameter
“sip.nat_stun.enable” is set to 1 (Enabled); if it is set to 2 (Manual NAT), it works only if the
value of the parameter “network.static_nat.enable” is set to 1 (Enabled).
Web User Interface:
Account->Register->NAT
Phone User Interface:
Menu->Advanced (default password: admin) ->Accounts->Account X->NAT Status
Note: Manual NAT cannot be configured via phone user interface.
network.static_nat.enable
0 or 1
0
Description:
Enables or disables the manual NAT feature on the IP phone.