For the last few weeks I have been bashing away at trying to get an inbound SIP trunk to go somewhere sensible, rather than to ‘Number not in service’ message being played to a caller.
The problem is that the inbound SIP call is classified by Asterisk as an ‘Unknown Peer’ with an error message similar to: “Received incoming SIP connection from unknown peer to xxxxxxxxx”. This means that the call can’t be processed correctly. After processing the information from a selection of forums, I have come up with this solution.
This article describes the changes needed to allow incoming SIP calls to be processed correctly, like any other trunk. This article does not cover SIP extensions, only SIP trunks.

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