[SIPForum-discussion] CANCEL request will be send from UAC to UAS at that time what response UAC will get

Fri Apr 20 10:46:20 UTC 2007

What I mean 2 say that  UAC has send invite request to UAS. UAS  gave
180 followed by 200ok. UAC has accepted the 200ok.

1.	before UAC  generating ACK  if it will send Cancel to UAS what
response it(UAC) will get???
2.	after UAC generating ACK if  if it will send Cancel to UAS what
response it(UAC) will get???
3.	 

________________________________

From: Robert Sparks [mailto:rjsparks at nostrum.com] 
Sent: Friday, April 20, 2007 12:41 PM
To: William Prusty
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] CANCEL request will be send from UAC
to UAS at that time what response UAC will get

This is answered in RFC3261.

The answer depends on how quickly the CANCEL occurred after the INVITE
it is associated with.

If the INVITE transaction state still exists, the CANCEL will receive a
200 (it does not matter that the INVITE was already accepted - the 200
CANCEL means "I got your CANCEL", not "I cancelled your INVITE". You
learn whether an INVITE has been cancelled through the final response to
the INVITE).

If the INVITE transaction has terminated, the CANCEL will receive a 481
Transaction not found.

RjS

On Apr 20, 2007, at 8:50 AM, William Prusty wrote:

Suppose call has been established . if CANCEL request will be send from
UAC to UAS at that time what response UAC will get 

Plz answer ASAP

With regards

                             william

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