Some personal attitudes:
In my mind, signalling is the thing we use to control media level.
But if we give up it: while user rejected a new modification, we wait for the user(or UA automatical) itself to send the Re-INVITE to make the session into the state the user once(the once means the user have show the rejecting desire) prefer.
And in fact, after some times of modification, the user itself can not know how to rebuild it. And after rejecting, the user will ask "Where is the original session", if he can not rebulit it. Some rich media usage, can be especially having this problem.
| "Christer Holmberg"
<christer.holmberg@xxxxxxxxxxxx>
2009-02-27 18:13 |
|
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.
From: sipping-bounces@xxxxxxxx [mailto:sipping-bounces@xxxxxxxx] On Behalf Of gao.yang2@xxxxxxxxxx
Sent: Friday, February 27, 2009 12:07 PM
To: Christer Holmberg
Cc: sipping-bounces@xxxxxxxx; sipping@xxxxxxxx; 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@xxxxxxxxxxxx>
2009-02-27 18:02 |
|
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@xxxxxxxxxxxx>
2009-02-27 17:31 |
|
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@xxxxxxxxxx [mailto:wang.libo@xxxxxxxxxx]
Sent: Friday, February 27, 2009 11:25 AM
To: Gonzalo Camarillo
Cc: Christer Holmberg; gao.yang2@xxxxxxxxxx; sipping@xxxxxxxx; sipping-bounces@xxxxxxxx
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@xxxxxxxxxxxx>
2009-02-27 17:10 |
|
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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