<p>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.</p>
<p>So there are two things<br>
a) duplicated INVITE (second is missing the Contact: header)<br>
b) the ACK and BYE are not relayed to the correct IP address</p>
<p>As mentioned I can reproduce this with certainty any time.  Endpoints that are not behind NAT don't seem affected.</p>
<p><a href="https://cloud.githubusercontent.com/assets/25922231/23190104/e40284f0-f84a-11e6-80f3-4f2739645fcb.png" target="_blank"><img src="https://cloud.githubusercontent.com/assets/25922231/23190104/e40284f0-f84a-11e6-80f3-4f2739645fcb.png" alt="with topos" style="max-width:100%;"></a></p>
<p><a href="https://cloud.githubusercontent.com/assets/25922231/23190113/ede3880c-f84a-11e6-840a-7b4e48a3327f.png" target="_blank"><img src="https://cloud.githubusercontent.com/assets/25922231/23190113/ede3880c-f84a-11e6-840a-7b4e48a3327f.png" alt="without topos" style="max-width:100%;"></a></p>
<p><a href="https://github.com/kamailio/kamailio/files/791821/badcall-sanitized.txt">badcall-sanitized.txt</a><br>
<a href="https://github.com/kamailio/kamailio/files/791823/goodcall-sanitized.txt">goodcall-sanitized.txt</a></p>

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