Avaya8500 to UCM 6.0 SIP Trunk

Unanswered Question

I have setup this trunk and currently have it working from Avaya to UCM, but not the other way around. I found the error message that I am getting from the Avaya.

"SIP/2.0 403 Forbidden(Invalid domain in From: header)" Seems that Cisco is send the Extension dialed @ UCM ip address (ex. [email protected]) where the Avaya is looking for [email protected], is there a way that I can tell the Cisco to do this? I currently have the domain specified under the ENTERPRISE PARAMETERS-->Domain Settings, but that doesn't seen to do anything.

I have this problem too.
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