Re: [MMUSIC] IANA registration of SDP attributes
Flemming Andreasen <fandreas@cisco.com> Tue, 05 April 2016 01:38 UTC
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To: Paul Kyzivat <pkyzivat@alum.mit.edu>, mmusic@ietf.org
References: <56E1C193.1050308@alum.mit.edu> <56E2EF31.2020808@alcatel-lucent.com> <56E2F67D.7060005@alum.mit.edu>
From: Flemming Andreasen <fandreas@cisco.com>
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Date: Mon, 04 Apr 2016 21:37:58 -0400
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Subject: Re: [MMUSIC] IANA registration of SDP attributes
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On 3/11/16 11:46 AM, Paul Kyzivat wrote: > On 3/11/16 11:15 AM, Juergen Stoetzer-Bradler wrote: >> Paul, >> >> The last alternative would have the advantage that different subprotocol >> documents could be referenced for the same attribute. Like e.g. for the >> setup attribute (if there were BFCP over data channel transport specific >> aspects): >> >> *SDP Name* *Level(s)* *Reference(s)* >> accept-types >> media, >> dcsa(MSRP) >> [RFC4975] >> [draft-ietf-mmusic-msrp-usage-data-channel] >> cat >> session >> [RFC4566] >> fmtp >> media,source [RFC4566][RFC5576] >> mediaclk >> session,media,source >> [RFC7273] >> ptime >> media >> [RFC4566] >> recvonly >> session,media, >> dcsa(MSRP) >> [RFC4566][RFC4975] >> [draft-ietf-mmusic-msrp-usage-data-channel] >> setup >> session, media >> dcsa(MSRP) >> dcsa(BFCP) >> [RFC4145] >> [draft-ietf-mmusic-msrp-usage-data-channel] >> [draft-schwarz-mmusic-bfcp-usage-data-channel] >> >> >> Therefore I'd be in favor of your last alternative. > > Let's see what other comments we get, especially from Flemming. > Thanks for putting this together Paul. My preference is also the last alternative. Thanks -- Flemming > Then, if this is preferred direction we can work on refining it. > > Thanks, > Paul > >> Thanks, >> Juergen >> >> >> On 10.03.2016 19:48, EXT Paul Kyzivat wrote: >>> [splitting off from the thread on data-channel-sdpneg] >>> >>> Currently IANA has five(!) separate registries for sdp attributes: >>> >>> att-field (session level) >>> att-field (both session and media level) >>> att-field (media level only) >>> att-field (source level) >>> att-field (unknown level) >>> >>> They all have the same format: >>> >>> *Type** >>> * *SDP Name** >>> * *Reference** >>> * >>> att-field (session level) cat [RFC4566] >>> att-field (both session and media level) recvonly >>> [RFC4566] >>> att-field (both session and media level) mediaclk >>> [RFC7273] >>> att-field (media level only) accept-types >>> [RFC4975] >>> att-field (media level only) fmtp >>> [RFC4566] >>> att-field (source level) fmtp >>> [RFC5576] >>> >>> >>> This format is a pain, because it is hard to look an attribute up if >>> you don't know at what level(s) it is valid. It also has the potential >>> to allow an attribute name to be registered for unrelated purposes if >>> the type is different. (IMO that would be bad.) >>> >>> A long time ago (several years now), as part of the 4566bis work, I >>> proposed that these tables be merged into one. It was my impression >>> that this was agreed and would be done. But I don't recall any >>> agreement on the logistics of doing so. >>> >>> My thought was that the combined table would look like: >>> >>> *SDP Name* *Level(s)* *Reference(s)* >>> accept-types >>> media >>> [RFC4975] >>> cat >>> session >>> [RFC4566] >>> fmtp >>> media,source [RFC4566][RFC5576] >>> mediaclk >>> session,media,source >>> [RFC7273] >>> ptime >>> media >>> [RFC4566] >>> recvonly >>> session,media >>> [RFC4566] >>> >>> >>> >>> Then we get to data channel attributes. My thought is to incorporate >>> them into this table structure, as yet another "level". E.g., >>> >>> *SDP Name* *Level(s)* *Reference(s)* >>> accept-types >>> media,dcsa >>> [RFC4975][draft-ietf-mmusic-msrp-usage-data-channel] >>> cat >>> session >>> [RFC4566] >>> fmtp >>> media,source [RFC4566][RFC5576] >>> mediaclk >>> session,media,source >>> [RFC7273] >>> ptime >>> media >>> [RFC4566] >>> recvonly >>> session,media,dcsa >>> [RFC4566][RFC4975][draft-ietf-mmusic-msrp-usage-data-channel] >>> >>> >>> (And this could also be extended for websockets if somebody proposes a >>> way to negotiate attributes for data channels too.) >>> >>> Using this format, if you want to know more than the name and the >>> level(s) at which it can be used you need to consult the references. >>> And when there are multiple references you don't know which one(s) you >>> need to consult. This can be "fixed" by including more information >>> from the reference into the registry. Conversely, we could strip it >>> down further and remove the levels from the registry - so you need to >>> consult the references for that too. >>> >>> For instance, if we wanted to simplify finding the right reference for >>> the level you are interested in, we could do: >>> >>> *SDP Name* *Level(s)* *Reference(s)* >>> accept-types >>> media, >>> dcsa >>> [RFC4975] >>> [draft-ietf-mmusic-msrp-usage-data-channel] >>> cat >>> session >>> [RFC4566] >>> fmtp >>> media,source [RFC4566][RFC5576] >>> mediaclk >>> session,media,source >>> [RFC7273] >>> ptime >>> media >>> [RFC4566] >>> recvonly >>> session,media, >>> dcsa >>> [RFC4566][RFC4975] >>> [draft-ietf-mmusic-msrp-usage-data-channel] >>> >>> >>> Or we could go further, and break the dcsa level down by subprotocol: >>> >>> *SDP Name* *Level(s)* *Reference(s)* >>> accept-types >>> media, >>> dcsa(MSRP) >>> [RFC4975] >>> [draft-ietf-mmusic-msrp-usage-data-channel] >>> cat >>> session >>> [RFC4566] >>> fmtp >>> media,source [RFC4566][RFC5576] >>> mediaclk >>> session,media,source >>> [RFC7273] >>> ptime >>> media >>> [RFC4566] >>> recvonly >>> session,media, >>> dcsa(MSRP) >>> [RFC4566][RFC4975] >>> [draft-ietf-mmusic-msrp-usage-data-channel] >>> >>> >>> Thoughts? >>> >>> Thanks, >>> Paul >>> >>> >>> >>> >>> _______________________________________________ >>> mmusic mailing list >>> mmusic@ietf.org >>> https://www.ietf.org/mailman/listinfo/mmusic >> >> >> >> _______________________________________________ >> mmusic mailing list >> mmusic@ietf.org >> https://www.ietf.org/mailman/listinfo/mmusic >> > > _______________________________________________ > mmusic mailing list > mmusic@ietf.org > https://www.ietf.org/mailman/listinfo/mmusic > . >
- [MMUSIC] IANA registration of SDP attributes Paul Kyzivat
- Re: [MMUSIC] IANA registration of SDP attributes Juergen Stoetzer-Bradler
- Re: [MMUSIC] IANA registration of SDP attributes Paul Kyzivat
- Re: [MMUSIC] IANA registration of SDP attributes Christian Groves
- Re: [MMUSIC] IANA registration of SDP attributes Paul Kyzivat
- Re: [MMUSIC] IANA registration of SDP attributes Christian Groves
- Re: [MMUSIC] IANA registration of SDP attributes Paul Kyzivat
- Re: [MMUSIC] IANA registration of SDP attributes Flemming Andreasen
- Re: [MMUSIC] IANA registration of SDP attributes Christian Groves
- Re: [MMUSIC] IANA registration of SDP attributes Paul Kyzivat
- Re: [MMUSIC] IANA registration of SDP attributes Christian Groves
- Re: [MMUSIC] IANA registration of SDP attributes Paul Kyzivat
- Re: [MMUSIC] IANA registration of SDP attributes Flemming Andreasen
- Re: [MMUSIC] IANA registration of SDP attributes Flemming Andreasen
- Re: [MMUSIC] IANA registration of SDP attributes Flemming Andreasen