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Re: [Sipping] 答复: RE: RE: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: ??: Re: Closing the offer/answer rollback issue
hi,
If the sdp is negotiated , there maybe a "MRFC" to allow the caller and callee only can use
the nogotiated codecs and disable the un-negotiated ones, and UEs cannot use other codecs.
There must be ways to solve this problem as we distinguish the successful negotiation from
fail ones.
But if we consider the sdp ,whose precondition is ok but rejected at last, as successful negotiation,
then it's hard to find a way to solve the illegal communications.
Eric
2009/2/27, Christer Holmberg <christer.holmberg at ericsson.com>:
So, what is the difference if the video is rejected using a re-INVITE error response, or a new SDP offer?
If users use other codecs than have been negotiated in the SDP I think is out of the scope of this discussion.
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.
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
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
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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