[Kamailio-Users] Need Assistance Tracking Down A SIP Signaling Problem

[Klaus Darilion]

Sounds like the carrier tries to do NAT traversal (fixing contact) 
although it should not.

regards
klaus

Geoffrey Mina schrieb:
> Hello,
> I am wondering if anyone can help me determine what the problem with
> my SIP signaling is here.  I have attached two Excel files (can
> provide other formats if someone doesn't have Excel).  The
> environments in both scenarios are almost identical... although I am
> dealing with two different carriers upstream.
> 
> In my environment, I have Kamailio (1.5) sitting in front of a
> multitude of Asterisk machines.  I am using the dispatcher module to
> distribute INVITE requests across the network.  I am doing some
> interop with a new carrier and we are struggling a bit with some
> looping scenarios.  They are sending invites to my Kamailio server, I
> am forwarding to asterisk.
> 
> The two XLS files (Success.xls) and (Fail.xls) have sip_trace
> information for the transactions.  As you can see in the Fail.xls, the
> ACK to the 200 OK gets looped back to the Kamailio server and never
> ends up reaching the Asterisk machine.  In the Success.xls, this
> doesn't happen.  The only thing I can see that's different is the
> Success carrier appears to be replacing the RURI in the ACK with the
> value of the Contact header... in the failed one, the RURI of the ACK
> is the IP of my Kamailio gateway.
> 
> I have read through the RFC 3261 to try and figure out what is
> breaking this, but haven't been able to.  I basically need to
> determine if the signalling is correct... what is wrong with my
> config... and if the signalling is wrong, what the carrier is doing
> incorrectly.
> 
> Thanks in advance!
> Geoff
> 
> 
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