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SIP Trunk gets 503 Service Unavailable

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InteropPbxs

InteropPbxs

Programmer
Sep 19, 2008
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I am routing a call using SIP into the Mitel. I am getting a 503 Service Unavailable response. In this case the RequestURI and To is a user registered on a 5212 phone. The From is an unknown user and is not data filled on Mitel.

I verified that I am hitting the Sip Peer because I can toggle on/off the "Authentication Option for Incoming Calls". When set to "Challenge-based" the call is correctly challenged.

Any ideas as to what is causing the 503 Service Unavailable response.
 
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