Re: [AVT] Final edits to RTP spec and A/V profile

[Pekka Pessi <Pekka.Pessi@nokia.com>]

Stephen Casner <casner@acm.org> writes:
>Attempt number three on the definition of an RTP session.  David Leon
>made some suggestions, and I fixed some typo problems.  Is this clear?
>And even more important, do you agree with what it specifies?

	What is the difference between an RTP cloud (a la section 7) and
	an RTP session?

>        RTP session: An association among a set of participants
>             communicating with RTP.  A participant may be involved in
>             multiple RTP sessions at the same time.  In a multimedia
>             session, each medium is carried in a separate RTP session
>             with its own RTCP packets.  A participant distinguishes
>             multiple RTP sessions by reception of different sessions
>             using different pairs of destination transport addresses,
>             where a pair of transport addresses comprises one network
>             address plus a pair of ports for RTP and RTCP.  

	Don't we have multiple mediums in a single RTP session, for
	example, with some MPEG4 packetization? So, s/medium/RTP media
	type/, or is it then a circular definition?

>All
>             participants in an RTP session may share a common
>             destination transport address pair, as in the case of IP
>             multicast, or the pairs may be different for each
>             participant, as in the case of individual unicast network
>             addresses and port pairs.  In the unicast case, a
>             participant may receive from all other participants using
>             the same pair of ports, or may use a distinct pair of ports
>             for each.

	I'd drop this text away, as a RTP session can consist of two
	multicast group connected via a translator or a mixer.

	I also think translators and mixers that forward CSRCs and SDESs
	should be mentioned in the definition.

						Pekka
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