Aastra Telecom 41-001343-02 manual Configuration Files

Network Settings

If you enable NAT, 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.

Note:

•By default, the IP phones use symmetric UDP signaling for outgoing UDP SIP messages. When symmetric UDP is ena- bled, the IP phone generates and listens for UDP messages using port 5060.If symmetric UDP signaling is disabled, the phone sends from random ports but it listens on the configured SIP local port. Refer to Symmetric UDP Signaling on page 6-25for more information.

•The IP phones also use symmetric TLS signaling for outgoing TLS SIP messages by default. When symmetric TLS is enabled, the IP phone uses port 5061 as the persistent TLS connection source port. When symmetric TLS signaling is disabled, the IP phone chooses a random persistent TLS connection source port for TLS messages from the TCP range (i.e. 49152...65535) after each reboot regardless of whether the parameter “sip outbound support” is enabled or dis- abled. Refer to Symmetric TLS Signaling on page 6-25for more information.

Configuring SIP and TLS Source Ports Using the Configuration Files

You use the following parameters to configure SIP and TLS ports for NAT traversal:

•sip local port

•sip local tls port

Configuration Files

For specific parameters you can set in the configuration files, see Appendix A, the sections:

•“Local SIP UDP/TCP Port Setting” on page A-26.

•“Local SIP TLS Port” on page A-27.

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