Re: [sipcore] Question on draft-camarillo-sipcore-reinvite-01.txt

Hi Gao,

that is why I wrote the draft about preconditions. However, not many
people showed interest in it at that time.

Cheers,

Gonzalo

gao.yang2@zte.com.cn wrote:
> 
> Hi,
> 
> Maybe clarification of precons has something beyond Re-INVITE handling 
> text.
> 
> As Re-INVITE handling text aims for updating of RFC3261, we may need a 
> detailed normative text for updating RFC3312 & RFC4032. And we can talk 
> topics relating to precons but outside of the scope of Re-INVITE 
> handling text, such as "resuming and suspending for session or for 
> separate stream".
> 
> Two separate text means different maintenance process and lifecycle. If 
> we can guarantee the consistency and integrality of the two text, I 
> think two text would be clear for two (relating) topics.
> 
> Thanks,
> 
> Gao
> 
> ===================================
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> 
> 
> *Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>*
> 发件人:  sipcore-bounces@ietf.org
> 
> 2010-01-14 16:33
> 
> 	
> 收件人
> 	SIPCORE <sipcore@ietf.org>
> 抄送
> 	
> 主题
> 	Re: [sipcore] Question on draft-camarillo-sipcore-reinvite-01.txt
> 
> 
> 	
> 
> 
> 
> 
> 
> Hi,
> 
> I have put together a new version of the draft:
> 
> http://users.piuha.net/gonzalo/temp/draft-ietf-sipcore-reinvite-pre01a.txt
> 
> Let me know if you have some comments before I submit it.
> 
> Regarding the decision about when a given change in the session state
> has been executed when preconditions are used, I have added a paragraph
> that summarizes our discussions and the following draft:
> 
> http://www.watersprings.org/pub/id/draft-camarillo-sipping-precons-00.txt
> 
> Please, read Section 5.
> 
> Sections 7 and 15 contain new rules to avoid glare situations and race
> conditions. These rules avoid nasty call flows that were able to get the
> UAs out of synch.
> 
> Some time ago, we discussed whether or not unreliable provisional
> responses could refresh the remote target. There are several problems
> with unreliable responses updating remote targets. First, we would need
> to define even more rules to avoid glare situations and race conditions.
> Second, SIP does not provide any ordering for unreliable provisional
> responses. Responses arriving out of order at the UAC could easily get
> both UAs out of synch. Therefore, only reliable responses can refresh
> remote targets, as was specified in RFC 3261 anyway.
> 
> We also discussed the applicability of the target refresh rules to
> initial INVITEs. The rules in the draft cover them as well so I do not
> think we need to add anything else to that end.
> 
> Thanks,
> 
> Gonzalo
> 
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> 
> 
> 
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