Yealink SIP-T2 SERIES Administrator's Manual page 749

A firewall protects an organization's IP network by controlling data traffic from outside
the network. If your IP phone communicates with other devices through a firewall, you
must configure your firewall to allow incoming and outgoing traffic to the IP phone
through the reserved ports and the required ports.
You must configure your firewall to allow incoming and outgoing traffic through the
following ports:
Port
5060
5060
5061
50000-50249
(default range)
By default, the IP phone communicates through UDP ports in the 50000 - 50249 range for
video and voice control. The phone uses only a small number of these ports during a
call. The exact number depends on the number of participants in the call, the protocol
used, and the number of ports required for the type of call: video or voice. It is only
applicable to SIP VP-T49G IP phones.
The following tables identify the number of ports required per connection by protocol
and the type of call.
Port Type
UDP SIP (default transport protocol)
SIP (when selecting the TCP transport
TCP
protocol)
SIP (when selecting the TLS transport
TCP
protocol)
Reserved ports on the IP phone.
TCP/UDP
For more information, refer to
Reserved Ports
Configuring Advanced Features
Description
on page 727.
727