Administrator’s Guide for SIP-T5 Series Smart Media Phones
74
Configuring the IP Phone for Use with a Firewall or NAT
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:
SIP (default transport protocol)
SIP (when selecting the TCP transport
protocol)
SIP (when selecting the TLS transport
protocol)
50000-50249
(default range)
Reserved ports on the IP phone.
For more information, refer to Reserved
Ports on page 74.
Reserved Ports
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.
The following tables identify the number of ports required per connection by protocol and the
type of call.
Required ports for a SIP two-way call:
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