RE: [Sipping] How to process a Second BYE with different Via Branch butwith same Cseq.

With the current wording concerning the change of Via branch, the
testcase is not correct since the BYE is forking/merging within the
dialog which is being released.  Thus the situation can lead to a 482 if
the merge is detected; the 482 is discussed within
draft-ietf-sipping-dialogusage.  Among the other possible responses are
481, 500, and 200.  However if the 200 is sent, it is not repeating the
last response as the testcase claims since the response's Via would be
different.

Yes; the testcase should indicate that the Via be the same if it is
trying to trigger a repeat of the last response.

________________________________

	From: Preethi.Sadasivan@aricent.com
[mailto:Preethi.Sadasivan@aricent.com] 
	Sent: Wednesday, July 11, 2007 3:52 AM
	To: sipping@ietf.org
	Subject: [Sipping] How to process a Second BYE with different
Via Branch butwith same Cseq.

	Hi, 
	  I have a query regarding the following testcase 

	Test specification - ETSI TS 102 027-2 V3.1.1 (2004-11) 
	TPId: SIP_CC_TE_CR_V_022 
	Status: Mandatory 
	Ref: RFC 3261 [1] sections 17.2.3, 17.2.2, 12.2.1.1 and 15.1.2. 
	Purpose: Ensure that the IUT, having already answer to a BYE
request, on receipt of a BYE request, before 
	timer J fires, including a Via header set with a different
branch parameter but with the Request- 
	URI, To tag, From tag, Call-ID and CSeq identical as in the
first BYE request, repeats its last 
	response. 

	Is the above test case and the expected behavior correct? 
	Should the above test case be stated as "with the same branch
parameter"?

	IMO, after sending a 200OK for the first BYE the UAS closes the
dialog but 
	the transaction as the stack should still remain till the Timer
J fires. The intent of 
	Timer J is to send the previous response (the same 200OK) in
case a 
	retransmitted BYE is received. 

	Please comment on the above observation and the test case. 

	Thanks and Regards,
	Preethi..

------------------------------------------------------------------------
------
	Preethi Sadasivan,
	Software Engineer,
	ARICENT ,
	Bangalore.
	tel: +91-80-41069118

------------------------------------------------------------------------
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