In view of the use of SDP by H.248.1 and by parts of BICC, this discussion of the interpretation of the bandwidth line may be of interest. The question is what the bandwidth estimate is intended to include beyond the media SDUs themselves.

-----Original Message----- From: Magnus Westerlund [mailto:magnus.westerlund@era.ericsson.se] Sent: Monday, October 07, 2002 7:23 AM To: IETF MMUSIC WG Cc: IETF AVT WG; IETF SIPPING WG Subject: [MMUSIC] Presenting draft-westerlund-mmusic-sdp-bwparam-00.txt

Hi all,

I have submitted a draft that discuss and tries to address the problem with having IP and transport level as a part of the SDP bandwidth modifiers. Specifically it looks at the b=AS:<bw-value>. The problems is several, but one of the major is a result of having two IP versions deployed and having translation between the two. Also header compression and future transport protocols (DCCP) creates problems.

So any person working with protocols using SDP (SIP, SAP, RTSP) or working with SDP and SDP-NG should look at this draft.

Until it becomes available in the IETF directories it can be fetched from here: <http://standards.ericsson.net/westerlund/draft-westerlund-mmusic-sdp-bwpara m-00.txt

Discussion is encouraged and any comments should be directed to the MMUSIC mailing list. SO PLEASE remove the other lists when replying.

Regards

Magnus Westerlund

Multimedia Technologies, Ericsson Research ERA/TVA/A ---------------------------------------------------------------------- Ericsson AB | Phone +46 8 4048287 Torshamsgatan 23 | Fax +46 8 7575550 S-164 80 Stockholm, Sweden | mailto: magnus.westerlund@era.ericsson.se

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