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[wang.libo at zte.com.cn]

hi:

>the assumption we are working on is that the user
would prefer that the
>failure of the re-INVITE does not trigger a sudden media change. That
>is, the media session would continue unchanged when the 4xx for the
>re-INVITE arrives.

  The modification triggered by Re-INVITE will
go on after failure of Re-INVITE, disregarding the signalling.
It's not acceptable, i believe. 


Also If pre-conditions are met,and re-INVITE
fails, UEs could use the new SDP. 
This solution will give someone a way
to escape charging.   
For example, if UEs use audio at the
first time, 
then one of them raise a re-INVITE with
a SDP carrying both audio and video, 
after the preconditions are met, then
the other rejects the re-INVITE, 
but they can communicate with both audio
and video after all.

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