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.

badcall-sanitized.txt
goodcall-sanitized.txt

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