[reSIProcate] Fw: CANCEL before provisional recieved.

[Volodymyr.Stepanov at aricent.com]

Byron Campen <bcampen at estacado.net> 
04.05.2007 16:53

To
Volodymyr.Stepanov at aricent.com
cc
<resiprocate-devel at list.resiprocate.org>
Subject
Re: [reSIProcate] Fw:  CANCEL before provisional recieved.






Sending a CANCEL before a provisional response is invalid behavior. Right 
now, the stack forges a CANCEL/200 and sends it to the TU, but does not 
allow the CANCEL to hit the wire. From here, if B never sends a 
provisional, the INVITE transaction will time-out, causing the stack to 
send a simulated INVITE/408. However, if B does respond, the call will 
continue normally. (This is something a TU must be prepared to handle; 
just because you get a CANCEL/200 doesn't mean the remote UAS will end the 
INVITE transaction.) If B does send a provisional, but never sends a final 
response, it is up to A to decide at what point it wishes to end the 
transaction. (The TU does this by sending a CANCEL; this will cause the 
stack to put a CANCEL on the wire, and start a timer that will cause the 
INVITE transaction to be torn down, if it never gets a response)

Best regards,
Byron Campen





Lets try again :)
B sends provisional,but there is large time gap between A INVITEs and  B 
receives this INVITE, and answers back.
I know that sending CANCEL before provisional is incorrect.
I trying to find "standart" solution for ,maybe, waiting for provisional 
or "freeze" CANCEL transaction.
Maybe there is another way to deal with my problem?
Thanks.

Sorry :)

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