Re: [Sipping] 答复: Re: 答复: Re: 答复: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: Closing the offer/answer rollback issue

[Gonzalo Camarillo <Gonzalo.Camarillo at ericsson.com>]

Hi,

at this point, the discussions are going in circles and are not
productive any longer. No new ideas are being introduced.

I think I now understand your main points (media synchronization and
session continuity) so that I can put together a more formal description
of the straw-man proposal in my original email that meets all the
requirements brought up here.

The proposal will be what the WG had agreed on before with slight
modifications (e.g., a clarification of the "in use" concept) in order
to better address your concerns.

Thanks for your input,

Gonzalo

gao.yang2 at zte.com.cn wrote:
> 
> Yes. I think it is can, not MUST.
> 
> And with precondition, the user can be hinted the new modification just 
> after Offer/Answer pairs.
> 
> 
> 
> 
> *Gonzalo Camarillo <Gonzalo.Camarillo at ericsson.com>*
> 
> 2009-02-27 18:22
> 
> 	
> 收件人
> 	wang.libo at zte.com.cn
> 抄送
> 	christer.holmberg at ericsson.com, gao.yang2 at zte.com.cn, sipping at ietf.org, 
> sipping-bounces at ietf.org, Eric.wangxr at gmail.com
> 主题
> 	Re: 答复: Re: 答复: Re: ??: Re: [Sipping] ??: Re:  ??: Re: ??: Re: ??: 
> Re: ??: Re: ??: Re:  Closing the offer/answer rollback issue
> 
> 
> 	
> 
> 
> 
> 
> 
> Hi,
> 
> UEB would have rejected the video stream in the 183 response.
> 
> Gonzalo
> 
> wang.libo at zte.com.cn wrote:
>  >
>  > HI,
>  >
>  >    I think the video will be established.The figure below shows the case.
>  >
>  >
>  >       1. REINVITE(audio，vedio)
>  > ----------------------------->
>  >         2. 183
>  > <-----------------------------
>  >       3. PRACK/200  
>  > <------------------------------>
>  >       4. UPDATE(audio，vedio)
>  > ----------------------------->
>  >         5. 200(audio，vedio)
>  > <-----------------------------
>  >
>  >         6. 4XX
>  > <-----------------------------
>  >
>  > After step 5, UEs' precondition are met ,and the video stream is
>  > established too.
>  > But UE-B send 4xx to reject 4XX (step 6).
>  >
>  > Regards.
>  >
>  >
>  >
>  >
>  > *Gonzalo Camarillo <Gonzalo.Camarillo at ericsson.com>*
>  >
>  > 2009-02-27 17:30
>  >
>  >                  
>  > 收件人
>  >                  wang.libo at zte.com.cn
>  > 抄送
>  >                  christer.holmberg at ericsson.com, 
> gao.yang2 at zte.com.cn, sipping at ietf.org,
>  > sipping-bounces at ietf.org
>  > 主题
>  >                  Re: 答复: Re: ??: Re: [Sipping] ??: Re:  ??: Re: ??: 
> Re: ??: Re: ??:
>  > Re: ??: Re:  Closing the offer/answer rollback issue
>  >
>  >
>  >                  
>  >
>  >
>  >
>  >
>  >
>  > Hi,
>  >
>  >  >   If UE-A wants to communicate with UE-B by video, but UE-B only 
> want to
>  >  > communicate by audio.
>  >
>  > then UE-B rejects the video stream and the video stream is never
>  > established.
>  >
>  > Cheers,
>  >
>  > Gonzalo
>  >
>  >
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