I-D ACTION:draft-gaoyang-sipping-session-state-criterion-00.txt

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	Title		: The Criterion of Session State
	Author(s)	: G. Yang
	Filename	: draft-gaoyang-sipping-session-state-criterion-00.txt
	Pages		: 12
	Date		: 2009-1-8
	
   There is debate on the topic of "Commit/Rollback of Offer/Answer on
   Unsuccessful re-INVITE".  The reason of the confusion is some
   application/session usages of offer/answer imply the nest
   transaction(mean transaction theory, not mean sip transaction)
   concept,but whitout unambiguous definition.  This paper reveal the
   concept of nest transactions in current RFC and other well known
   application/session usages.  And then clarify that there is no
   ambiguous state of session modification using current RFC definition.

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