Subject: [MMUSIC] SDP and SDP-new: control media type

From: [email-masked]
Date: Wed, 28 Apr 2004 22:49:59 +0300

(if you're not an SDP guru, you may wish to check the relevant snips at the bottom first)

For sdp-new...

Since conference is a subset (example) of session, is there any good reason why the control media type is for "conference control channel for the session" as opposed to "any control channel for the session"?

My reason for asking is: if a media were entirely dedicated to control data, but the session were not a conference (e.g. a webcast) then the natural media type would still seem to be control even though the SDP spec seems to disallow this (in favour of data media type) - which seems odd.

If there are no great reasons for the limitation to conferece control, why not change the sdp text to say:
   "control" is used to specify an additional control channel for the session.

Cheers, Rod.

Note, relevant snips are:

sdp-new (and SDP) describe the "control" media type usage as:

   The first sub-field is the media type.  Currently defined media are
   "audio", "video", "application", "data" and "control" ...
   ... "control" is used to specify an additional
   conference control channel for the session.

(e.g. m=control 49234 H323 mc)

And also defines session and conference thus:

   Conference: A multimedia conference is a set of two or more
      communicating users along with the software they are using to
      communicate.

   Session: A multimedia session is a set of multimedia senders and
      receivers and the data streams flowing from senders to receivers.
      A multimedia conference is an example of a multimedia session

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