Yealink SIP-T2 SERIES Administrator's Manual page 767

Parameters
Enables or disables NAT Rport feature for IP call.
0-Disabled
1-Enabled
2-enable direct process
Note: It is only applicable to SIP VP-T49G IP phones.
Web User Interface:
Account->SIP IP Call->RPort
Phone User Interface:
Menu->Advanced (default password: admin) ->VC Accounts->SIP IP Call->RPort
To configure Rport feature for account via web user interface (take SIP-T23G IP phones
for example):
1. Click on Account->Advanced.
2. Select the desired account from the pull-down list of Account.
3. Select the desired value from the pull-down list of RPort.
4. Click Confirm to accept the change.
To configure Rport feature for IP call via web user interface (take SIP VP-T49G IP phones
for example):
1. Click on Account->SIP IP Call.
Configuring Advanced Features
Permitted Values Default
745