Re: [MMUSIC] Draft new version: draft-ietf-mmusic-sdp-bundle-negotiation-06 - Colin's comments
Christer Holmberg <christer.holmberg@ericsson.com> Wed, 09 April 2014 11:26 UTC
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Colin Perkins <csp@csperkins.org>
Thread-Topic: [MMUSIC] Draft new version: draft-ietf-mmusic-sdp-bundle-negotiation-06 - Colin's comments
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Date: Wed, 09 Apr 2014 11:26:29 +0000
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Subject: Re: [MMUSIC] Draft new version: draft-ietf-mmusic-sdp-bundle-negotiation-06 - Colin's comments
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HI Colin, >Section 8.1.1 starts: > > By default, all RTP based media within a BUNDLE group belong to a > single RTP session [RFC3550]. Multiple BUNDLE groups will form > multiple RTP Sessions. > > NOTE: The usage of multiple RTP sessions within a BUNDLE group, or > the usage of a single RTP session that spans over multiple BUNDLE > groups, is outside the scope of this specification. Other > specification needs to extend the BUNDLE mechanism in order to allow > such usages. > > When a single RTP session is used, all bundled "m=" lines > representing RTP based media share a single SSRC numbering space > [RFC3550]. > > I suggest rephrasing this as: > > All RTP-based media within a single BUNDLE group belong to a > single RTP session [RFC3550]. Multiple BUNDLE groups will form > multiple RTP sessions, one per bundle group. > > Since a single RTP session is used for each bundle group, all > "m=" lines representing RTP-based media in a bundle group will > share a single SSRC numbering space [RFC3550]. > > Similarly, in the Introduction, I suggest changing: > > The default assumption is that all Real-Time Protocol (RTP) [RFC3550] > based media flows associated with a BUNDLE group belong to the same > RTP Session [RFC3550]. Future extensions can change that assumption. > > to > > All Real-time Transport Protocol (RTP) [RFC3550] based media flows > associated with a single BUNDLE group belong to a single RTP session > [RFC3550]. > > The rationale for this change is that supporting multiple RTP sessions on a single 5-tuple is a significant change to RTP, for example > to introduce a shim-layer, that did not receive consensus in AVTCORE. These changes align the bundle draft with that decision, and reword the text for clarity. I am ok with your suggestion, as long as other multiple-RTP-session advocates don't object :) Regards, Christer On 7 Apr 2014, at 09:06, Christer Holmberg <christer.holmberg@ericsson.com> wrote: > We have submitted a new version (-06) of BUNDLE. > > As you will see, the document has been re-structured quite a bit. The main reason for that was to align the SDP offer/answer procedures with the RFC 3264 structure (I had to do that for another draft, so I decided to do the same thing also for BUNDLE - rather now than when we reach WGLC). > > The draft does have a dependency on an RTP header indicator, and the completion of draft-ietf-mmusic-sdp-mux-attributes, but otherwise there are currently no BUNDLE specific open issues. > > Regards, > > Christer > > _______________________________________________ > mmusic mailing list > mmusic@ietf.org > https://www.ietf.org/mailman/listinfo/mmusic -- Colin Perkins http://csperkins.org/
- Re: [MMUSIC] Draft new version: draft-ietf-mmusic… Christer Holmberg