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the type of NAT. For more information on the NAT types, refer to
address and port number that the NAT has allocated for the UDP connections to remote parties. The protocol
requires assistance from a third-party network server (STUN server) usually located on public Internet. The IP
phone can be configured to act as a STUN client, to send exploratory STUN messages to the STUN server. The
STUN server uses those messages to determine the public IP address and port used, and then informs the client.
Capturing packets after you enable the STUN feature, you can find that the IP phone sends Binding Request to the
STUN server, and then mapped IP address and port is placed in the Binding Response: Binding Success
Response MAPPED-ADDRESS: 59.61.92.59:19232.
SIP and TLS Source Ports for NAT Traversal
You can configure the SIP and TLS source ports on the IP Phone. Previously, the IP phone used default values
(5060 for UDP/TCP and 5061 for TLS). In the configuration files, you can use the following parameters to configure
the SIP and TLS source ports:
•
Local SIP Port
•
TLS SIP Port
If NAT is disabled, the port number is shown in the Via and Contact SIP headers of SIP messages. If NAT is
enabled, the phone uses the NAT port number (and NAT IP address) in the Via and Contact SIP headers of SIP
messages, but still use the configured source port.
528
"NAT Types"
and to obtain the mapped (public) IP
Matrix SPARSH VP710 User Guide
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