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

[gao.yang2 at zte.com.cn]

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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