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


If the new Re-INVITE is mandatory one, it is OK from the solution itself.

But I think it is heavy one :)

As there is light one, why not.




"Christer Holmberg" <christer.holmberg at ericsson.com>

2009-02-27 18:57

收件人
<gao.yang2 at zte.com.cn>
抄送
"Gonzalo Camarillo" <gonzalo.camarillo at ericsson.com>, <sipping at ietf.org>, <sipping-bounces at ietf.org>
主题
RE: RE: [Sipping] 答复: RE: RE: Re: ??: Re:  ??: Re:  ??: Re: ??: Re: ??: Re: ??: Re: ??: Re:  Closing the offer/answer rollback issue





If UE-B does not want to use video, he would have to send a new SDP offer, where video is removed. Mid-boxes etc would then remove the video.
 
If UE-B does not remove the video, he will be charged for it etc. There is nothing "illegal" about that.

From: gao.yang2 at zte.com.cn [mailto:gao.yang2 at zte.com.cn]
Sent: Friday, February 27, 2009 12:30 PM
To: Christer Holmberg
Cc: Gonzalo Camarillo; sipping at ietf.org; sipping-bounces at ietf.org
Subject: 答复: RE: [Sipping] 答复: RE: RE: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: Closing the offer/answer rollback issue





"Christer Holmberg" <christer.holmberg at ericsson.com>

2009-02-27 18:13


收件人
<gao.yang2 at zte.com.cn>
抄送
<sipping-bounces at ietf.org>, <sipping at ietf.org>, "Gonzalo Camarillo" <gonzalo.camarillo at ericsson.com>
主题
RE: [Sipping] 答复: RE: RE: Re: ??: Re:  ??: Re:  ??: Re: ??: Re: ??: Re: ??: Re: ??: Re:  Closing the offer/answer rollback issue







So, what is the difference if the video is rejected using a re-INVITE error response, or a new SDP offer?

The difference is that:

"Late commitment", if user reject it, any mid-box knows the modification should be discarded. And the two sides have no way to use it anymore.
And everything is clear.

"If in use, let it alone", if user reject it, any mid-box let the modification alone. And the two sides can use it (illegal).
And you may say the mid-box can close the gate. Then which case should be close? I think the classfication would be the same as (which case should)rollback.

If users use other codecs than have been negotiated in the SDP I think is out of the scope of this discussion.


From: sipping-bounces at ietf.org [mailto:sipping-bounces at ietf.org] On Behalf Of gao.yang2 at zte.com.cn
Sent: Friday, February 27, 2009 12:07 PM
To: Christer Holmberg
Cc: sipping-bounces at ietf.org; sipping at ietf.org; Gonzalo Camarillo
Subject: [Sipping] 答复: RE: RE: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: Closing the offer/answer rollback issue


I just mean that B can pretend to reject the adding vedio modification request. But A and B use vedio after the rejecting 4xx.

That is yhe illegal situation.



"Christer Holmberg" <christer.holmberg at ericsson.com>

2009-02-27 18:02


收件人
<gao.yang2 at zte.com.cn>
抄送
"Gonzalo Camarillo" <gonzalo.camarillo at ericsson.com>, <sipping at ietf.org>, <sipping-bounces at ietf.org>, <wang.libo at zte.com.cn>
主题
RE: RE: Re: ??: Re: [Sipping] ??: Re:  ??: Re: ??: Re: ??: Re: ??: Re: ??: Re:  Closing the offer/answer rollback issue







Hi,

>If B do not do so, then A and B can use it illegal. That's what I said times :)  

I am not sure I understand...

If B doesn't want to use video, he should remove it (no matter how it is done).

If he doesn't remove it, it will be used, charged for etc. I don't know what is "illegal" by that.

Regards,

Christer



"Christer Holmberg" <christer.holmberg at ericsson.com>

2009-02-27 17:31


收件人
<wang.libo at zte.com.cn>, "Gonzalo Camarillo" <gonzalo.camarillo at ericsson.com>
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<gao.yang2 at zte.com.cn>, <sipping at ietf.org>, <sipping-bounces at ietf.org>
主题
RE: Re: ??: Re: [Sipping] ??: Re:  ??: Re: ??: Re: ??: Re: ??: Re: ??: Re:  Closing the offer/answer rollback issue







Hi,

If preconditions are met for the video stream, but UE-B then decideds that he doesn't want to video, an alternative to "late commitment" is for UE-B to send a new re-INVITE/offer to UE-A and remove the video.

Regards,

Christer


From: wang.libo at zte.com.cn [mailto:wang.libo at zte.com.cn]
Sent: Friday, February 27, 2009 11:25 AM
To: Gonzalo Camarillo
Cc: Christer Holmberg; gao.yang2 at zte.com.cn; sipping at ietf.org; sipping-bounces at ietf.org
Subject: 答复: Re: ??: Re: [Sipping] ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: Closing the offer/answer rollback issue


Hi Gonzalo Camarillo,

If UE-A wants to communicate with UE-B by video, but UE-B only want to communicate by audio.
and if they uses the new SDP, when pre-conditions met, UE-B will send his/her videos regardless
of UE-B's willing.
And if UE-B never send his video although the pre-conditions are met, then UE-A will be puzzled why
he/she is charged for vedio while receiving NO vedio from UE-B.

I think this is a operational problem that we have to solve too.

regards,
Eric
Gonzalo Camarillo <Gonzalo.Camarillo at ericsson.com>

2009-02-27 17:10


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








Hi,

> Also If pre-conditions are met,and re-INVITE fails, UEs could use the
> new SDP.
> This solution will give someone a way to escape charging.  
> For example, if UEs use audio at the first time,
> then one of them raise a re-INVITE with a SDP carrying both audio and
> video,
> after the preconditions are met, then the other rejects the re-INVITE,
> but they can communicate with both audio and video after all.

No, if they negotiate video and the preconditions are met, they will be
charged for video, regardless of what happens with the re-INVITE.

Cheers,

Gonzalo


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