IP Phone Release Notes 2.2
Features in Release 2.2
NAT Traversal Features
Configurable SIP and TLS Source Ports
A System Administrator can now 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.
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.
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