Support "draft-gaoyang-sipping-session-state-criterion-00.txt", and some questions.

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I am very interested in this topic(session state after Non-successful Re-INVITE). And I have paid attention to it for a long time.
I just hear from my friend that there is a draft on this topic currently( I did not see any personal or WG draft on this topic before).
 
I think the description in this one is effective and it is what I am looking for! And the introduction is suit for the evolution of media tech.
 
Questions:
 
1. How you think the method of using a new Re-INVITE to refresh the session state?
Because this is a easy and also effective way. I once heared a SDP attribute of "chain" which might make the question complex.
As you paid so much attention on this topic, I think you might have thought about "using a new Re-INVITE to refresh the session state".
 
2. "in the future we define a complex application/session which need negotiation of session parameter using offer/answer in many times for one modification"
Is this just a description in theroy or you have some research on such media types.
 
Thanks.
 
 
 
 
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