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

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

Hi,

> 1. Make session state just out of signal control.

no, we are not specifying any new rules about how to control the media
state. To decide the media state in use at any given point, we are just
 using the traditional rules we use to control media. No new rules here.
Therefore, your point above is not valid.

> 2. Is the session state the one user prefer?

we need to decide what will be the default media state after the
re-INVITE fails. The idea is that we define a default behavior that is
in line with what the user prefers *most of the time*. Obviously, there
will be cases where the user prefers something else because the default
behavior cannot possibly cover all cases. In those cases where the user
prefers something else, the user can issue a new re-INVITE or UPDATE.

> If A want to use vedio, and B reject it. But A and B can use vedio and 
> say that they have rejected using it by signal, and operater can not 
> bill it.

If B rejects the video stream the operator should not be charging for it
because there is no video stream to charge for.

Cheers,

Gonzalo