________________________________________
From: Sven Evensen [[email protected]]

should be cseq=2 in line 5, which is a fault from the ITSP?:

sipX sends REGISTER cseq=1.
after 500ms sipX resends REGISTER cseq=1.
a few ms later 401 cseq=1 is received for first REGISTER.
sipX sends new REGISTER with nonce cseq=2.
sipX receives 401 cseq=2 (fault ITSP?) from resent first REGISTER and
trunk is "blocked"
sipX receives 200 OK cseq=2 from REGISTER with nonce, but disregards it.
________________________________________

You can tell if the ITSP has made a mistake by comparing the Via header 
'branch' values -- they should match the CSeq in requests and responses.

If you've sent a snapshot, we can see this.

We probably should have a more sophisticated algorithm for restoring service on 
a trunk.  On the other hand, this does seem to be an ITSP problem and they 
should fix it.

Dale
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