Re: [Sipping] Reconciling O/A rollback with dialog state rollback

["Christer Holmberg" <christer.holmberg at ericsson.com>]

Hi,

>>Christer's proposal 2 for the offer/answer situation 
>>is to stay with whatever offer/answer exchange 
>>completed successfully last (perhaps in the INVITE/183 below). 
>
>I don't have a strong opinion on the topic; I'd actually prefer 100rel
>usage for re-INVITE be deprecated. :)
>
>I'm curious why preferring not to follow rfc3261 section 14.1: "If a UA
>receives a non-2xx final response to a re-INVITE, the session parameters
>MUST remain unchanged, as if no re-INVITE had been issued."?

That was the other alternative (full rollback). However, there a race condition issues identified for that (see previous discussions), which we couldn't find a good solution for. 

>If an UPDATE is successfully processed while a re-INVITE is occuring, I
>agree that the updates caused by the UPDATE and UPDATE 2xx should not be
>rolled back upon re-INVITE failure.

Well, that IS the alternative we chose to go for - any offer/answer that has succeeded remains valid :)

I'll get back to the target issue later.

Regards,

Christer




> Would it also be acceptable to stay with whatever remote 
> Target was successfully set last?

What is meant by "successfully set last"?  Is the proposal for 1)
updating per received target update request or 2) it having triggered a
2xx?

Since it might be relevant to the discussion, what is the current
interpretation of rfc3261 concerning a re-INVITE 18x with an updated
Contact?  Is the current proposal to alter the current interpretation of
rfc3261?

Thanks,
Brett
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_______________________________________________
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