Hi
It is 2-17 morning here now. And I think you are sleeping now :).
Comments in lines.
Gaoyang
"Christer Holmberg" <christer.holmberg@xxxxxxxxxxxx> 写于 2009-02-17 02:01:37:
> Hi,
>
> >I MUST point out that:
> >Chapter 4.3.3 is not the solution in theory for race condition
> problem, it is just BCP level.
> >Chapter 4.3.2 is the solution in theory.
>
> Well, 4.3.3 still solves the problem :)
[gaoyang] Yes. :)
>
> >And the racing condition problem described here is not same with
> the one in 6.2 of "draft-ietf-sipping-sip-offeranswer".
> >The one in 6.2 of "draft-ietf-sipping-sip-offeranswer" does not exist here.
>
> I know. The race condition in the offeranswer draft is about when
> both endpoints send a new offer at the same time, which is a
> completely separate issue.
[gaoyang] Yes. So I say this solution is racing condition free.
And you warried whether the solution is use-case oriented. And if I have time, I will write a new mail for further explanation.
>
> Regards,
>
> Christer
>
>
>
> > Date: Mon, 16 Feb 2009 14:41:59 +0100
> > From: christer.holmberg@xxxxxxxxxxxx
> > To: gao.yang2@xxxxxxxxxx
> > CC: wang.libo@xxxxxxxxxx; sipping@xxxxxxxx
> > Subject: Re: [Sipping] About "rollback of re-Invite"
> >
> >
> > Hi,
> >
> >
> > >>I also pay high attention to the topic of "rollback of re-Invite".
> > >>As lots of service is implemented on the network using SIP, and
> > >>different ways may be carried out by different corporations, it's
> > necessary to define
> > >>a complete and clear method to solve the failure when the unsuccessful
> > re-Invite
> > >>happens.
> > >
> > >I agree, and we thought that having a generic rule, not related to
> > >specific use-cases, would be the most clear, clean and complete
> > >solution.
> > >
> > >[gaoyang] It is simple and clear. But it disregard nature property of
> > nest ed transaction. I concluded incorrectness and drawback of such way.
> > More details in
> > http://www.ietf.org/internet-drafts/draft-gaoyang-sipping-session-state-
> > analysis-01.txt.
> >
> > I agree it's not the most "beautiful" solution - that's why we spent a
> > long time discussing it.
> >
> > >>And the problems "Commit any session parameters that have been
> > sucessfully changed"
> > >>metioned in "draft-gaoyang-sipping-session-state-analysis-01.txt" need
> > further discuss,
> > >>I think.
> > >
> > >The draft does not define a generic rule. It more or less says that
> > >every time there is a new use-case, the offer/answer rollback aspects
> > >needs to be documented for that use-case. I think that is something we
> > >wanted to avoid.
> > >
> > >[gaoyang] It is not use-case oriented, but rules/definition oriented.
> > >And the defini tion of how o/a pairs form nested transaction should be
> > open for future.
> > >Such as "a=chain" and so on extension can form more o/a pairs as nested
> > transaction. It is not use-case.
> > >We can have a further talk.
> > >
> > >If I understand chapter 4.3.3 correct, it says that if you have a
> > >pending re-INVITE transaction, a NEW modification must be sent in a
> > >re-INVITE request. That way we would get rid of the race condition
> > >problem. That is an interesting point. I guess the question is whether
> > >it's too lake to make such a rule.
> > >
> > >[gaoyang] Is the "lake" late? I think it can be BCP, not rules :).
> >
> > Perhaps, yes.
> >
> > Regards,
> >
> > Christer
> >
> >
> > _______________________________________________
> > Sipping mailing list https://www.ietf.org/mailman/listinfo/sipping
> > This list is for NEW devel opment of the application of SIP
> > Use sip-implementors@xxxxxxxxxxxxxxx for questions on current sip
> > Use sip@xxxxxxxx for new developments of core SIP
>
>
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