答复: RE: RE: non-200 response to PRACK

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"Christer Holmberg" <christer.holmberg@xxxxxxxxxxxx> 写于 2009-04-09 13:56:50:

>
> 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?


>
> 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:  [Sipping] 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
>    
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