RE: [XCON] xcon-conf-sidebars 01 comments

["Brian Rosen" <br at brianrosen.net>]

Yeah, fundamentally, I agree, and in fact we don't really need
sidebars at all as a first class object

EXCEPT

People want to be able to invite someone into a sidebar who is
NOT in the main conference.  For that, you need a separate
URI for the sidebar, and you need signaling for that participant
to get into the sidebar, because he doesn't have a dialog
for the main conference.  That should be the only SIP signaling.

Now you do need to be invited into a sidebar and you need to
accept.  That's not SIP, and it's not MPCP it's CPCP I think.
That's the signaling the draft discusses.

The template defines what happens to the mix when you are in
a sidebar, and provides any controls you might have, a main
conference gain control for example.

Brian

-----Original Message-----
From: xcon-bounces at ietf.org [mailto:xcon-bounces at ietf.org] On Behalf Of
Cullen Jennings
Sent: Saturday, July 31, 2004 5:53 PM
To: Brian Rosen; Alan Johnston; XCON-IETF
Subject: [XCON] xcon-conf-sidebars 01 comments


In many ways, a sidebar is just an media mixing artifact of a conference. If
Alice and Bob are in a conference and decided to have a sidebar, that is
some hints to the mixer about who hears what. If Alice is dialed into the
conference from the PSTN, then uses a web interface to move into a sidebar,
I would find it very odd to see ReInvites or any other signaling going to
the PSTN GW that Alice is using. Are we all in agreement on this so far?

In section 2 it mentions that it does not seem useful to have a separate
dialog for the sidebar. I agree complete with this but in other parts of the
document it seemed to be creating new dialogs for the sidebar.

In a multimedia conference, it is often only some the media streams that are
moved to the sidebar - not the user. So I might have a text or audio sidebar
but still be watching the video of the main conference.

I have been wondering if sidebars were more a MPCP issue that CPCP issue
(other than who had permission to create them).

Cullen



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