Re: [sipcore] About Join and Replaces Headers:

[Paul Kyzivat <[e-mail]>]

On 9/27/2010 11:44 AM, [e-mail] wrote:
>
> Paul,
>
>  > An INVITE with Join or Replaces has its own offer/answer to negotiate
>  > the media used. If the new party wants to use less (or more) media than
>  > the existing call it can just negotiate that.
>
> Yes, the new party can put less(or more) m= lines in the SDPs. But the
> UAS's behavior for the new party's INVITE request is not clear.
>
> Considering Join header, there's no such defintion in RFC3911.

That's not surprising, since Join is an extension to 3261.
The semantics come from the join spec.

It seems those say that when you get an invite with Join, you should 
create a conference. And then do mixing as required. If the conferencing 
of the new call doesn't require mixing, that's fine too.

	Thanks,
	Paul

> Thanks,
>
> Gao
>
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