Justin,
A new draft ("draft-ietf-sipping-race-examples-01.txt", Dated: Mar 5th,
2007) is released in IETF which deals with various race conditions in
SIP. Section 3.1.2 explains your scenario.
Regards,
Goutham M.P
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Justin Lu
Sent: Wednesday, May 23, 2007 1:18 PM
To: [email protected]
Subject: [Sip-implementors] Race condition -- CANCEL and 2xx
It is said in Section 9 in 3261 that
"In that usage, a UAS that receives a CANCEL request for an INVITE, but
has not yet sent a final response, would "stop ringing", and then
respond to the INVITE with a specific error response (a 487)."
My question is what does the UAS do when it already sent out the final
response (but not received by the UAC) and receives the CANCEL request?
Justin
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