Yealink SIP-T2 SERIES Administrator's Manual page 760

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Click Confirm to accept the change.
4.
To configure NAT traversal and STUN server via phone user interface (take SIP-T23G IP
phones for example):
Press Menu->Settings->Advanced Settings (default password: admin)
1.
->Network->NAT->NAT Status.
Press
2.
field.
Enter the IP address or the domain name of the STUN server in the STUN Server field.
3.
Enter the port of the STUN server in the Port field.
4.
Press the Save soft key to accept the change.
5.
The IP phone reboots automatically to make settings effective after a period of time.
To configure NAT traversal for a specific account via phone user interface (take SIP-T23G
IP phones for example):
Press Menu->Settings->Advanced Settings (default password: admin) ->Accounts.
1.
Press
2.
Press
3.
field.
Press the Save soft key to accept the change.
4.
NAT Types
Symmetrical NAT
In symmetrical NAT, the NAT router stores the address and port where the packet was sent. Only
packets coming from this address and port are forwarded back to the private address.
Full Cone NAT
In full cone NAT, all packets from a private address (e.g., iAddr: port1) to public network will be
sent through a public address (e.g., eAddr: port2). Packets coming from the address of any
server to eAddr: port2 will be forwarded back to the private address (e.g., iAddr: port1).
Address Restricted Cone NAT
Restricted cone NAT works similar like full cone NAT. A public host (hAddr: any) can send
packets to iAddr: port1 through eAddr: port2 only if iAddr: port1 has previously sent a packet to
hAddr: any. "Any" means the port number doesn't matter.
Port Restricted Cone NAT
Port restricted cone NAT works similar like full cone NAT. A public host (hAddr: hPort) can send
packets to iAddr: port1 through eAddr: port2 only if iAddr: port1 has previously sent a packet to
736
or , or the Switch soft key to select the desired value from the NAT Status
or to select the desired account and press the Enter soft key.
or , or the Switch soft key to select the desired value from the NAT Status