Yealink SIP-T21 E2

Setting Up Your System
111
Parameters
Permitted Values
Default
Phone User Interface:
None
sip.tls_listen_port
0, Integer from 1024
to 65535
5061
Description:
Configures the local TLS listen port.
If it is set to 0, the IP phone will not listen the TLS service.
Web User Interface:
Settings->SIP->TLS SIP Port
Phone User Interface:
None
To configure NAT traversal and STUN server via web user interface:
1. Click on Network->NAT.
2. In the STUN block, select the desired value from the pull-down list of Active.
3. Enter the IP address or the domain name of the STUN server in the STUN Server field.
4. Enter the port of the STUN server in the STUN Port (1024~65000) field.
5. Click Confirm to accept the change.
A dialog box pops up to prompt that the settings will take effect after a reboot.
6. Click OK to reboot the phone.
To configure manual NAT via web user interface:
1. Click on Network->NAT.
2. In the Nat Manual block, select the desired value from the pull-down list of Active.