Closed #570.
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Thanks, Daniel. You've convinced me :D
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Actually this needs to be handled by the client side. If it has already
answered with 200ok, should reject the CANCEL with a negative response.
Kamailio is proxy and cannot generate requests on behalf o devices. This is a
well known race and the resolution by SIP RFC is that in case of receiving
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
