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Comments inline. > Subject: RE: Summary of Closing the offer/answer rollback issue? > Date: Mon, 2 Mar 2009 14:45:10 +0100 > From: christer.holmberg@xxxxxxxxxxxx > To: gao.yang.seu@xxxxxxxxxxx; gao.yang2@xxxxxxxxxx; shin@xxxxxxxxxxxxxxx > CC: sipping@xxxxxxxx; gonzalo.camarillo@xxxxxxxxxxxx > > Hi, > > As we know, sometimes when you use preconditions you may do some modifications for a stream, in ADDITION to simply change the precondition status. I guess the most typical example is codec refine, ie you reduce the sets of codecs when it's know what both ends support. > > Wouldn't it be possible to say that whatever change is done for a stream, if the the re-INVITE fails before the preconditions have been met everything will be rolled back for that stream? [Gao] If all the Offer/Answer pairs during the suspending state are part of the original modification, it is. But if there is a new modification, it is not. > > So, if I send an UPDATE and remove a codec, while preconditions still haven't been met, that codec change would also be rolled back if the re-INVITE fails. > > > SDP before re-INVITE audio-codec = 4 > > ----- re-INVITE audio-codec = 1,2,3 precon = not_met --- > > <---- 18x audio-codec = 1,2,3 precon = not_met ----- > ----- UPDATE audio-codec = 1 precon = not_met ----> //codec refine > <---- 200 audio-codec = 1 precon = not_met ----- > > <---- 4xx -------------------------------------------------------------- > > > SDP after re-INVITE audio-codec = 4 > [Gao] If treat "refine codec" as part of the original modification, it is. > > Regards, > > Christer > > > > > > ________________________________ > > From: gaoyang [mailto:gao.yang.seu@xxxxxxxxxxx] > Sent: 2. maaliskuuta 2009 15:32 > To: Christer Holmberg; gao.yang2@xxxxxxxxxx; shin@xxxxxxxxxxxxxxx > Cc: sipping@xxxxxxxx; Gonzalo Camarillo > Subject: RE: Summary of Closing the offer/answer rollback issue? > > > 1. > The question is same as asking whether "refine codec" is a new modification or just part of the original modification. > > By RFCs, it is a new modification. But I can not stop other people to treat as part of the original modification. > > If "refine codec" is a new modification by UPDATE/200OK, its commitment will go on and without rollback. > If "refine codec" is part of the original modification, it will rollback for the faillure the original modification. > ; Not matter by which point of view, the session state is all clear. > > 2. > I have no right to decide it("refine codec") alone. > > If people want to reach a consensus to this point, we can talk further. > > If ask my personal view, I can accept: > 2.1 treat it as new modification. or > 2.2 treat it as part of the original modification, but "protected" by precondition. > > Why "protected" by precondition? > By RFCs it is new modification at all, and as to make it part of the original modification, we should have semantics of suspending/resuming modification. > > How "protected" by precondition? > We can define that only use "refine codec" in suspending state of QoS precondition. > IMO, it is better to define a new precondition type for "refine codec". > > > > Date: Mon, 2 Mar 2009 12:02:54 +0100 > > From: christer.holmberg@xxxxxxxxxxxx & gt; > To: gao.yang2@xxxxxxxxxx; shin@xxxxxxxxxxxxxxx > > CC: sipping@xxxxxxxx; gonzalo.camarillo@xxxxxxxxxxxx > > Subject: Re: Summary of Closing the offer/answer rollback issue? > > > > > > Hi, > > > > > > >Explanation for Precondition notification > > > > > >Precondition notification can be treated as part of the original modification triggered by Re-INVITE. > > > > > >And only SDP with Precondition notification and without any other modification of session, during suspending state of session > > >modification, is called precondition notification. > > > > So, what if I e.g. Also do a "codec refine" inside a precondition notficiation? > > > > Regards, > > > > Christer > > > > > > > > > > > > > > ; > > > > > > > > > > > OKUMURA Shinji <shin@xxxxxxxxxxxxxxx> > > > > 2009-03-02 17:43 > > > > > > 收件人 > > sipping <sipping@xxxxxxxx> > > 抄送 > > "Christer Holmberg" <christer.holmberg@xxxxxxxxxxxx>, gao.yang2@xxxxxxxxxx, Gonzalo Camarillo <gonzalo.camarillo@xxxxxxxxxxxx> > > 主题 > > Re: Summary of Closing the offer/answer rollback issue? > > > > > > > > > > > > > > Hi, > > > > The following table describes my understanding. > > Is this right? > > > > signaling | O/A state | media in use > > ---------------------+--------------------------------+-------------- > > init-INVITE/200/ACK | audio1(met) | audio1 > > re-INVITE/183-rel | audio2(notmet) | au dio1 > > (PRACK/200OK) | audio2(met) +video1(notmet) | audio2 > > UPDATE/200OK | audio2(met) +video1(met) | audio2+video1 > > UPDATE/200OK | audio2(met) +video2(notm et) | audio2+video1 > > 4xx/ACK | | > > Gonzalo's proposal | audio2 +video1 | > > Gao's proposal | audio1 +video1(?) | > > > > > > Regards, > > Shinji > > > > > > > > -------------------------------------------------------- > > ZTE Information Security Notice: The information contained in this mail is solely property of the sender's organization. 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