I pushed the commit 785326cdfbee849a8436e7c07003ff0539d259cd to allow 183 without contact.
An 183 creates an early session, can be followed by PRACK, which needs the contact, I am
not sure now if it is mandatory, but I have seen 183 without contact, so it should be fine
to accept it without contact. It will be backported till the next point release.
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