[sr-dev] [kamailio/kamailio] SIP Forking race condition (#570)

[Phil Lavin]

Pcap that demonstrates this (I had to zip it for GitHub) is: [fork-fail-filtered.zip](https://github.com/kamailio/kamailio/files/221097/fork-fail-filtered.zip). In this example, Kamailio is a registration proxy.

If two phones answer the call at the same time, it is possible for the CANCEL to be received by one of the phones after it has entered the `completed` state. It will, thus, respond with a `481` or similar. Kamailio then continues to process the traffic sent by the cancelled phone.

Ideally, Kamailio should `ACK` and `BYE` the `200` if it ends up in this state.

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