Mitel Forums > Mitel MiVoice Business/MCD/3300

SIP Trunk gets 503 Service Unavailable

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interopPbxs:
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.

ralph:
Try looking at the COS to verify that "Public Network" connections are allowed.  That and interconnect restriction.  Also check the trunk service assignment form to be sure the number of digits to absorb is set to '0' not nul.
I'd bet the issue is in the COS.

Ralph

interopPbxs:
Thanks....

The problem was the number of digits to absorb. Changed it from a blank field to 0 and calls started to work.

ralph:
Beauty.  Thanks for letting us know what fixed it.

Ralph

EllisD:
I have to post a thank-you in here also.  Spent 2 days trying to figure out this exact same problem.

Changed the null to a 0 and bingo!!

Thanks.

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