[SIP IOS] Unregistration fails with "400 Bad Request"

Unanswered Question
Jun 19th, 2008
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I'm trying to register a Cisco 1760 on a Cirpack SoftSwitch using the SIP protocol.

I can correctly register the lines, but there is no way to unregister them afterwards. When I try, I get a "400 Bad Request" answer from the SS.

My guess: the Via: field in the REGISTER message shows port 5060, while the SIP packets come from a different port.

Is there any way to force the sip-ua to use the 5060/udp as the suorce port for sending SIP packets to the softswitch?

P.S.: example capture file in attachment

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