Re: [rtcweb] FW: New Version Notification for draft-holmberg-mmusic-sdp-multiplex-negotiation-00.txt

[Christer Holmberg <[e-mail]>]

Hi Muthu,

You suggestion looks good, and I'll implement it in the next version of the draft.

Thanks!

Regards,

Christer 


> -----Original Message-----
> From: Muthu Arul Mozhi Perumal (mperumal) [mailto:[e-mail]] 
> Sent: 16. syyskuuta 2011 14:26
> To: Christer Holmberg; [e-mail]; IETF - MMUSIC
> Subject: RE: [rtcweb] FW: New Version Notification for 
> draft-holmberg-mmusic-sdp-multiplex-negotiation-00.txt
> 
> The approach looks good overall. A quick comment on section 
> 5. SDP Offer/Answer Procedures:
> 
> |When an SDP offerer wants to offer multiplexed media, it inserts the 
> |same port number value for each "m=" line that is part of 
> the offered 
> |multiplex.  In addition, the SDP offerer inserts an SDP 
> session-level 
> |"a=group" attribute, with a "MULTIPLEX" value, and assigns an SDP 
> |media-level "a=mid" attribute value for each "m=" line that 
> is part of 
> |the offered multiplex.
> 
> Suggestion:
> 
> An entity generating an SDP offer or answer describing 
> multiplexed media does the following:
> 1. Inserts the same port number for each "m=" line that is part of 
>    the multiplex.
> 2. Uses the same connection data ("c=" line) values for each media 
>    stream that is part of the multiplex.
> 3. Inserts the same RTCP port number in the "a=rtcp" attribute for
>    each media stream that is part of the multiplex, when the RTCP 
>    port is not the next higher (odd) port number following the RTP 
>    port described in the "m=" line.
> 4. Inserts an "a=rtcp-mux" attribute for each media stream that is
>    part of the multiplex, when RTCP is multiplexed with RTP on the 
>    same port.
> 5. Inserts an SDP session-level "a=group" attribute, with a 
> "MULTIPLEX" 
>    value, and assigns an SDP media-level "a=mid" attribute value for 
>    each "m=" line that is part of the multiplex.
> 
> Muthu
> 
> |-----Original Message-----
> |From: [e-mail] [mailto:[e-mail]] On
> Behalf Of Christer Holmberg
> |Sent: Wednesday, September 14, 2011 4:17 PM
> |To: [e-mail]
> |Subject: [rtcweb] FW: New Version Notification for
> draft-holmberg-mmusic-sdp-multiplex-negotiation-
> |00.txt
> |
> |
> |
> |Hi,
> |
> |I've submitted a draft in MMUSIC, which defines a mechanism and
> grouping framework extension in order
> |to negotiate multiplexing of media associated with multiple m= lines.
> |
> |The main difference from Harald's previous proposal is that 
> it defines
> the usage of the same port
> |number value for multiple m= lines, and every m= line is used to
> describe media even in the case of
> |multiplex.
> |
> |Comments are welcome :)
> |
> |Regards,
> |
> |Christer
> |
> |
> |
> |
> |> -----Original Message-----
> |> From: [e-mail] [mailto:[e-mail]]
> |> Sent: 14. syyskuuta 2011 13:32
> |> To: Christer Holmberg
> |> Cc: Christer Holmberg
> |> Subject: New Version Notification for 
> |> draft-holmberg-mmusic-sdp-multiplex-negotiation-00.txt
> |>
> |> A new version of I-D,
> |> draft-holmberg-mmusic-sdp-multiplex-negotiation-00.txt has been 
> |> successfully submitted by Christer Holmberg and posted to the IETF 
> |> repository.
> |>
> |> Filename:	 draft-holmberg-mmusic-sdp-multiplex-negotiation
> |> Revision:	 00
> |> Title:		 Multiplexing Negotiation Using Session
> |> Description Protocol (SDP) Port Numbers
> |> Creation date:	 2011-09-14
> |> WG ID:		 Individual Submission
> |> Number of pages: 9
> |>
> |> Abstract:
> |>    This document defines how to use the Session 
> Description Protocol
> |>    (SDP) in order to negotiate the usage of multiplexed media.
> |>
> |>
> |>
> |>
> |>
> |> The IETF Secretariat
> |>
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