[Users] Call not torn down when CANCEL sent before INVITE message is finished being processed

[Tavis P]

With the latest CVS build of OSER, when an INVITE is sent followed by a
CANCEL, before OSER has finished processing the initial INVITE, the
outbound call is not torn down, and SER routes the CANCEL message to
itself. 

Below is an ngrep trace of the exchange.


I have a development cluster of mediaproxy servers setup and one of them
was taken offline but left in the loop which increased the time it took
for a message to be processed which is how i came across this situation
(it took some seconds before the INVITE was able to be transmitted to
the nexthop_proxy)



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