It can solve all the problem elegantly and with out any extension and violation. And the draft:
http://www.ietf.org/internet-drafts/draft-gaoyang-sipping-session-state-criterion-01.txt
The just can not accept the way "Commit any session parameters that have been sucessfully changed", because there are some serious problems beneath it's presentational
easy and practical character.
To analyse incorrectness and drawback of other methods bypass the session state, another draft has been posted:
http://www.ietf.org/internet-drafts/draft-gaoyang-sipping-session-state-analysis-01.txt
I do not think all people interested in this topic can accept it immediately, so I think it should be talked widely.
Any comments/issues/feelings/notions/emotions/emoticons are welcome.
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