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

[Eric Burger <eburger at brooktrout.com>]

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.

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