Yealink SIP-T2 Series Administrator's Manual page 52

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
Web UI Account->Register->NAT
T54S/T52S/T48S/T48G/T46S/T46G/T29G:
Menu->Advanced (default password: admin)->Accounts->Account X->NAT Status
Phone UI T42G/T42S/T41P/T41S/T40P/T40G/T27G/T23P/T23G/T21(P) E2/T19(P) E2/CP920:
Menu->Settings->Advanced Settings (default password: admin)->Accounts->AccountX->NAT Status
Note: Manual NAT cannot be configured via phone user interface.
Parameter static.network.static_nat.enable
Description It enables or disables the manual NAT feature on the IP phone.
Permitted
0-Disabled
1-Enabled
Values
Default 0
Web UI Network->NAT->Manual NAT->Active
Parameter static.network.static_nat.addr
It configures the IP address to be advertised in SIP signaling.
It should match the external IP address used by the NAT device.
Description Example:
static.network.static_nat.addr = 10.3.5.33
Note: It works only if "static.network.static_nat.enable" is set to 1 (Enabled).
Permitted
IP Address
Values
Default Blank
Web UI Network->NAT->Manual NAT->IP Address
Parameter static.sip.nat_stun.enable
Description It enables or disables the STUN (Simple Traversal of UDP over NATs) feature on the IP phone.
Permitted
0-Disabled
1-Enabled
Values
Default 0
Web UI Network->NAT->STUN->Active
T54S/T52S/T48S/T48G/T46S/T46G/T29G:
Menu->Advanced (default password: admin) ->Network->NAT->NAT Status
Phone UI
T42G/T42S/T41P/T41S/T40P/T40G/T27G/T23P/T23G/T21(P) E2/T19(P) E2/CP920:
Menu->Settings->Advanced Settings (default password: admin) ->Network->NAT->NAT Status
Parameter static.sip.nat_stun.server
It configures the IP address or domain name of the STUN (Simple Traversal of UDP over NATs) server.
Description Example:
static.sip.nat_stun.server = 218.107.220.201
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