I cannot provide a pcap as there's too much private information, but I have 
prepared a graphical representation of the flow in both cases and a sanitized 
text dump of the SIP dialog in both cases.  I hope this sufficiently 
illustrates the problem.

So there are two things
a) duplicated INVITE (second is missing the Contact: header)
b) the ACK and BYE are not relayed to the correct IP address

As mentioned I can reproduce this with certainty any time.  Endpoints that are 
not behind NAT don't seem affected.

![with 
topos](https://cloud.githubusercontent.com/assets/25922231/23190104/e40284f0-f84a-11e6-80f3-4f2739645fcb.png)

![without 
topos](https://cloud.githubusercontent.com/assets/25922231/23190113/ede3880c-f84a-11e6-840a-7b4e48a3327f.png)

[badcall-sanitized.txt](https://github.com/kamailio/kamailio/files/791821/badcall-sanitized.txt)
[goodcall-sanitized.txt](https://github.com/kamailio/kamailio/files/791823/goodcall-sanitized.txt)


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