[SIPForum-discussion] : Invite Cancel Response sequence

[srinivas.banda at wipro.com]

Hi Chethan,
 
In the below call flow:
487 is going first from the UE-2 to UE-1, which will completely clears
the INVITE transaction, if this happens UE-2 may not able to send the
200 OK for CANCEL.
So it is advisible to send 200 OK for the CANCEL first and then send 487
for the INVITE.
 
Regards
Srinivas

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of chethan prakash
Sent: Wednesday, October 07, 2009 4:11 PM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] : Invite Cancel Response sequence


Hello All,
 
Can you please kindly clarify if there is anything wrong the below
mentioned INVITE Cancel Response Sequence, 
 
UE 1                                    UE 2
    --------------INVITE-----------------> 
    <---------- 100 Trying---------------
    <---------- 180 Ringing-------------
    -------------CANCEL----------------> 
    <---------- 487 (INVITE)------------
    <---------- 200 OK (CANCEL)----
 
Please forward me the RFC Section where it is stated that on receiving
cancel we should respond to Cancel Request first before we send final
response to Invite Request.
 
 
Regards,
Chethan
 
 
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