Hi, >>But the two subject has association: this one is your proposed subject's precondition. >> >>If we can accept all 200OK of PRACK, non-200 lead to termination of session, why next? > >Sure. If we decide that a non-200 response would terminate the >session we don't need to worry about whether a non-200 response >terminates the re-transmission of the reliable response or not. > >But, I don't think we have an agreement on that. The current >agreement is that it IS allowed to send a non-200 response, so >therefor I think it is also ok to discuss how the re-transmission >would be affected. > > >[Gao] Is the agreement you mentioned reached during the IETF meeting? I would need to double check exactly what was agreed when. At least we decided during an IETF meeting that it should be allowed to reject a PRACK SDP offer using a 4xx response. I think we then later on the list realized that a PRACK can be rejected for other reasons also. Of course we can change previously made agreements (we have done that before - for good and bad), but I think we should have good reasons to do so. Regards, Christer >And, even if we would agree that a non-200 response would terminate >the session, I still think it would be an update to RFC3262. We >would also need to describe HOW the session is terminated, ie by >error responses, BYE/CANCEL etc. You cannot now assume that the UAS >will send an error response to the INVITE, and terminate the session >that way, if e.g. the error response to the PRACK was sent by an >intermediate. And, you cannnot assume that an intermediate which >sends an error response to a PRACK would start sending BYEs/CANCELs. >The intermeidate may not have any knowledge of PRACK - it rejects it >e.g. due to overload. > [Gao] Yes. But it is just complementarity, not overthrow. > > Regards, > > Christer > > > > > > > > > > 收件人 > <gao.yang2@xxxxxxxxxx>, "Paul Kyzivat" <pkyzivat@xxxxxxxxx> > 抄送 > <sipping-bounces@xxxxxxxx>, <sipping@xxxxxxxx> > 主题 > RE: non-200 response to PRACK > > > > > > > Propose people use an appropriate subject. > > > ________________________________ > > From: sipping-bounces@xxxxxxxx [mailto:sipping-bounces@xxxxxxxx] > On Behalf Of gao.yang2@xxxxxxxxxx > Sent: 9. huhtikuuta 2009 4:45 > To: Paul Kyzivat > Cc: sipping-bounces@xxxxxxxx; sipping@xxxxxxxx; Christer Holmberg > Subject: [Sipping] 答复: Re: 答复: RE: Re: 答复: Re: 答复: Re: > PRACK: Change MUST requirement to include SDP offer in first > reliable provisional response > > > Hi, > > I just mean: > > All the usage can be used in PRACK, we call it Set. > By current RFC3262, can be used in PRACK, we call it SubSet1. > SubSet1 is very small. And if we do usage beyond SubSet1, the > termination of session is acceptable (for me). > So, I recommend that the UAS return a 200 when it has not been > able to process the PRACK due to an error, then terminate the session. > > About authorization, I think, we can do authorization in PRACK(It > is a choice, not mandatory thing.), but we should do not do it in > PRACK by current RFC3262. > > If people want to enrich SubSet1, I think it is needed to modify > RFC3262 and find a way to solve the problem. > > Thanks > Gao > > > BTW: the mail thread is bigger than 40KB, I just send a mail > bigger than 40KB. > Propose people cut the mail short :) > > > Paul Kyzivat <pkyzivat@xxxxxxxxx> 写于 2009-04-08 20:04:27: > > > > > > > gao.yang2@xxxxxxxxxx wrote: > > > > > > Please see the previous mail: > > > > > > as UAS MUST return 2xx, then we can *deduce* that it is UAC's > obligation > > > to make sure UAS will accept the PRACK. > > > > I think that in general we can presume that the UAC doesn't *expect* > > that its PRACK will be rejected. Yet the PRACK can fail for no fault on > > the part of the UAC, and no fault on the part of the UAS either. > > > > I've already given the example of authorization failure. > > > > Its simply a faulty spec that presumes it can ignore the possibility of > > errors. All we are trying to do is *fix* that so that things will > > continue to function in a predictable way in the face of an error. > > > > Would you honestly recommend that the UAS return a 200 when it has not > > been able to process the PRACK due to an error? > > > > Thanks > > Paul > > -------------------------------------------------------- > ZTE Information Security Notice: The information contained in > this mail is solely property of the sender's organization. This mail > communication is confidential. Recipients named above are obligated > to maintain secrecy and are not permitted to disclose the contents > of this communication to others. > This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom they > are addressed. If you have received this email in error please > notify the originator of the message. Any views expressed in this > message are those of the individual sender. > This message has been scanned for viruses and Spam by ZTE Anti-Spam system. > > > > -------------------------------------------------------- > ZTE Information Security Notice: The information contained in > this mail is solely property of the sender's organization. This mail > communication is confidential. 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