Re: Summary of Closing the offer/answer rollback issue?

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>>Then that is: Considering RFCs, "refine codecs" is "a new modification". 
>>                 
>>Not considering "evolution and extension", it is still a solution without any violation of RFCs. 
>
>Yes, but that was not the point. I am trying to figure out what the differences between the proposals are. 
>
>[Gao] Yes. 
>
>But what I think important for "evolution and extension" is nested transaction. And if using something like "a= chain"(RFC3108) in Offer/Answer, nested transaction concept can be more 
>effective.

Yes, but we can have "something likes" - we need clear rules.

>So, again: is the "late commitment" currently the ONLY difference between yours and Gonzalo's proposals, or is there something else? 
>
>[Gao] IMO, "Late commitment" is the most important branching for current SIP/SDP usage. 

That is not what I asked.

Regards,

Christer



                
                
                
                
                
                "Christer Holmberg" <christer.holmberg@xxxxxxxxxxxx> 

                2009-03-02 14:21 

                                 
                                 收件人
                                 <gao.yang2@xxxxxxxxxx> 
                                 抄送
                                 "Gonzalo Camarillo" <gonzalo.camarillo@xxxxxxxxxxxx>, "Hadriel Kaplan" <HKaplan@xxxxxxxxxxxxxx>, "sipping" <sipping@xxxxxxxx>, <sipping-bounces@xxxxxxxx> 
                                 主题
                                 RE: Re:  Summary of Closing the offer/answer rollback issue?

                                 




                Hi, 
                  
                Again, I strongly do NOT think we should choose an "evolution and extension" approach, and let organizations decide what is a new modification, and what isn't. Again, you can have entities which belong to DIFFERENT organizations´communicating with each other, and those should have a common understanding of the rules. 
                  
                If you have a closed network, where you know that every entity belongs to a single organization, you can of course do whatever you want. But, in that case you don't need to standardize it. 
                  
                Regards, 
                  
                Christer 
                
                
________________________________

                From: gao.yang2@xxxxxxxxxx [mailto:gao.yang2@xxxxxxxxxx] 
                Sent: 2. maaliskuuta 2009 5:47
                To: Christer Holmberg
                Cc: Gonzalo Camarillo; Hadriel Kaplan; sipping; sipping-bounces@xxxxxxxx
                Subject: 答复: Re:  Summary of Closing the offer/answer rollback issue?
                
                
                My draft is open for evolution and extension. My view is that: 
                
                Considering RFCs, "refine codecs" is "a new modification". And if some one(org/operator/internal usage) think "refine codecs" is part of the original modification. It still can assure its session state by nested transaction concept. 
                
                Some custom-built one really treated it as part of the original modification. 
                
                
                
                
                "Christer Holmberg" <christer.holmberg@xxxxxxxxxxxx> 
                发件人:  sipping-bounces@xxxxxxxx 

                2009-03-02 05:30 

                                 
                
                                 收件人
                                 "Hadriel Kaplan" <HKaplan@xxxxxxxxxxxxxx>, "Gonzalo Camarillo" <gonzalo.camarillo@xxxxxxxxxxxx>, "sipping" <sipping@xxxxxxxx> 
                                 抄送
                                 
                                 主题
                                 Re:  Summary of Closing the offer/answer rollback issue?


                                 


                
                
                
                
                Hi Hadriel,
                
                I guess Gonzalo will provide his summary soon, but I don't think there
                is currently a disagreement regarding pre-conditions. You call them
                "conditional offers", Gao calls them "notifications", but that's just
                wording... :)
                
                I think the one of the main issues at the moment is what happens after
                preconditions have been met on both sides:
                
                1) Is the change now commited/in-use, and a re-INVITE failure would not
                change that?                                       <----- "in-use"
                alternative
                
                OR
                
                2) Would a re-INVITE failure cause a fallback (this is what is meant by
                "late commitment")?                                <---- "late
                commitment" alternative
                
                
                If preconditions have NOT been met, and the re-INVITE fails, I think
                most agree that there will be a rollback to the "last committed state".
                
                
                Gao's draft also talk about other changes which would not be considered
                as "real" SDP offers, for example if you reduce codecs. But, at least I
                strongly prefer NOT to go into such details, because that would for sure
                cause interop issues. I am not sure what Gao's view on that is at the
                moment, though?
                
                
                Regarding the race condition, I think we can avoid that with some BCP-
                and guidance text.
                
                
                Regards,
                
                Christer
                
                
                
                -----Original Message-----
                From: Hadriel Kaplan [mailto:HKaplan@xxxxxxxxxxxxxx] 
                Sent: Saturday, February 28, 2009 5:26 PM
                To: Christer Holmberg; Gonzalo Camarillo; sipping
                Subject: Summary of Closing the offer/answer rollback issue?
                
                
                Is there an email in this long thread that summarizes the issues?
                It's impossible to follow this thread. :)
                
                I'm not clear on what the issues are with pre-conditions that make
                failed offers concept break.  To me, pre-conditions are basically not
                real SDP offers; they're conditional offers.  Until the *all* the
                conditions are met, it's not "committed".  You continue using the last
                committed state.  I know there are race conditions, but considering how
                rare pre-conditions are in the real world (especially in re-Invite's),
                that I'm having trouble imagining why we should care about corner cases
                of such.  Regardless, I vote for any fixing that needs to happen because
                of pre-conditions should be around changing pre-condition logic, even if
                it means completely re-writing how pre-conditions works - don't change
                normal SIP or SDP. (not that anyone is proposing it, I just can't tell
                form this thread)
                
                Re-Invites and SDP offer/answer have so many interop issues in the wild
                even without pre-conditions, that this whole thread scares me. :(
                
                -hadriel
                
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