RE: [XCON] SIP or beneath SIP on conf-sidebars-01

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

In most cases, when you enter a sidebar, your SDP does not change.
The only time you need new SDP is if you need to add (or delete,
but that would be uncommon) a media stream.  The same is true
if you change roles.  You could even have a control that enabled
a media stream necessitating an SDP change.

You don't reInvite to the sidebar URI, you stay with the main
conference.  The sidebar URI is only needed for a participant
to join the sidebar, but not the main conference.

So I think we're pretty consistent:
	You reInvite if your role or sidebar or control situation
		causes a media change
	You use the main conference URI except in the case of
 		in the sidebar, not in the main conference situation

It really, really is a mixer thing.  There are corner cases that
make it more complicated, but that's always true.

Brian

-----Original Message-----
From: xcon-bounces at ietf.org [mailto:xcon-bounces at ietf.org] On Behalf Of Eric
Burger
Sent: Monday, August 02, 2004 9:44 AM
To: xcon at ietf.org
Subject: [XCON] SIP or beneath SIP on conf-sidebars-01

A bunch of the reqs, like the discussion around REQ-9 on the first paragraph
of page 5, sound like who gets listened to in the sidebar.  However, isn't
it who is speaking?  "a user can only listen to a single audio stream at a
time", while strictly true, sounds like you can't have a mix.  The mix *is*
the single audio stream.

In the next paragraph, the sidebar is discussed as an SDP thing.  I'm not
sure I agree with the previous discussion
<http://www1.ietf.org/mail-archive/web/xcon/current/msg00694.html> that a
sidebar is not a SIP thing.  What is the difference between INVITing to a
new URI versus a re-INVITE with different SDP.

Likewise, in section 4, "if the sidebar has different media types than the
main conference, then the focus will need to re-INVITE" highlights this
issue.  By not considering the sidebar as a SIP object, you have this
convoluted "if-then-else-if-then-else" method of creating sidebars.  If the
sidebar is a SIP object, then there is one and only one method of creating,
joining, changing, etc. sidebars.  Much easier.

_______________________________________________
XCON mailing list
XCON at ietf.org
https://www1.ietf.org/mailman/listinfo/xcon





_______________________________________________
XCON mailing list
XCON at ietf.org
https://www1.ietf.org/mailman/listinfo/xcon