Re: [Sipping] Liaison Statement on offer/answer procedures

[Anders Kristensen <andersk at cisco.com>]

Christer Holmberg wrote:
>> - If an UPDATE (inside or outside of a reINVITE) fails, any o/a in the 
>> UPDATE has no effect on the media session state. 
>>
>> [Ian Elz ] OK, but how will we determine if an UPDATE is inside or outside a re-INVITE? 
>  
> [Christer] I assume that any stateful entity must know whether it has a pending re-INVITE transaction for a specific call or not.

That's not actually enough. A UAS (or dialog stateful proxy) cannot know 
whether an UPDATE received shortly after a 2xx is sent upstream was sent 
before or after the 2xx was received by the UAC. We could add an 
explicit indication to that effect, I suppose...

Anders
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