AASTRA 6700i series, 9143, 9480i, 9480i CT SIP Administrator Guide EN - Manual (Page 197)

4-34 41-001343-01 Rev 03, Release 3.2.2
SIP and TLS Source Ports for NAT Traversal
A System Administrator 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). The two
new parameters for configuring the SIP and TLS source ports are:
•
sip local port
• sip local tls port
You can configure the SIP and TLS source ports using the configuration files or the Aastra Web
UI. After configuring these parameters, you must reboot the phone.
If NAT is disabled, the port number also shows in the VIA and Contact SIP headers.
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.
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
Note: 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.If
symmetric UDP signaling is disabled, the phone sends from random
ports but it listens on the configured SIP local 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-33.
• “Local SIP TLS Port” on page A-33.