Symmetric udp signaling, Symmetric udp signaling -38 – AASTRA 6700i series, 9143, 9480i, 9480i CT SIP Administrator Guide EN User Manual
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Symmetric UDP Signaling
By default, the IP phones use symmetric UDP signaling for outgoing UDP SIP messages. When
symmetric UDP is enabled, the IP phone generates and listens for UDP messages using port
5060.
You can manually disable symmetric UDP signaling using the IP phone’s configuration file.
When you disable symmetric UDP signaling, then the IP phone chooses a random source port
for UDP messages.
The IP phone also chooses a random source port for UDP messages if you configure a backup
proxy server, registrar server, or outbound proxy server.
An Administrator can configure symmetric UDP signaling using the configuration files only.
Configuring Symmetric UDP Signaling Using the Configuration Files
You use the following parameter to enable or disable Symmetric UDP Signaling in the
configuration files:
•
sip symmetric udp signaling
Configuration Files
For the specific parameter you can set in the configuration files, see Appendix A, the section,
on