Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP SDP syntax question
Christian Groves <Christian.Groves@nteczone.com> Wed, 01 October 2014 07:45 UTC
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Date: Wed, 01 Oct 2014 17:44:55 +1000
From: Christian Groves <Christian.Groves@nteczone.com>
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To: Salvatore Loreto <salvatore.loreto@ericsson.com>
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Subject: Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP SDP syntax question
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Hello Salvatore, Thanks for the replies. Please see some comments below. Regards, Christian On 1/10/2014 5:29 PM, Salvatore Loreto wrote: > Hi Christian, > > thanks a lot for reading and reviewing the draft > see more in line > > On Sep 30, 2014, at 3:48 PM, Christian Groves <Christian.Groves@nteczone.com> wrote: > >> I seemed to have got cut and paste happy in 1) below. The "1*(SP sctp-fmt)" should only apply to "DTLS/SCTP". >> >> Christian >> >> On 30/09/2014 10:12 PM, Christian Groves wrote: >>> Hello Salvatore, >>> >>> There seems to be several issues with the updated syntax: >>> >>> 1) Cl.4.1 Media Description: With the updated syntax the ability to have more than one usage of the SCTP association has been lost as "sctp-fmt" is a single value. > > <Sal> > there have been several discussion about the ability to have more than one usage of the SCTP association, > and has been agreed not to allow it. > So each 'm' line describes a single SCTP association; each association has only one single specify usage. > </Sal> [CNG] So how would I specify in SDP a scenario where BFCP uses a DTLS/SCTP association and MSRP uses a DTLS/SCTP association where they both use the same DTLS connection? Are these to be separate m-lines? > > > ..snip.. >>> 3) Cl.4.1.2: There appears to be a formal space (SP) missing from the syntax between association-usage and max-message-size. >>> >>> sctpmap-attr = "a=fmtp:" association-usage [max-message-size] >>> >>> should be: >>> sctpmap-attr = "a=fmtp:" association-usage [SP max-message-size] >>> >>> The current syntax allows an fmtp usage with no max-message-size parameter, e.g. "a=fmtp:bfcp". Should this be allowed? > <Sal> > this has been discussed back in April or May. It has been decided that the max-message-size parameter is optional. > In the case it is not present the default value is 64K > </Sal> [CNG] I agree that the max-message-size parameter is optional, in that case an endpoint wouldn't specify the whole a=ftmp: line. It seems strange to allow the endpoint to specify half a line? >>> 5) Cl.4.1.2: "If the parameter is not present, the implementation should provide a >>> default, with a suggested value of 64K." Is this 64,000 or is 65,535 bytes? [CNG] I think you skipped this? >>> 7) Cl.10: How will this registry relate to the “WebSocket Subprotocol Name Registry” (http://www.iana.org/assignments/websocket/websocket.xml#subprotocol-name)? > <Sal> > It is not related. The 'association-usage' specifies how the SCTP association will be used. > For example in the case of webrtc-datachannel value it would indicate how to pair certain streams, > how to consider specific stream etc. > as described in https://tools.ietf.org/html/draft-ietf-rtcweb-data-protocol-08 and in > http://tools.ietf.org/wg/rtcweb/draft-ietf-rtcweb-data-channel/ > > the WebSocket Subprotocol Name Registry is used to populate the protocol field in the > protocol field in https://tools.ietf.org/html/draft-ietf-rtcweb-data-protocol-08#section-5 > > </Sal> [CNG] So if I use the SCTP association for "bfcp" then i'd need to document this in the new registry associated with the draft? and if I then used "bfcp" for webrtc-datachannel then i'd need to update the websocket registry. Two places for the same protocol?
- [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP SDP s… Christian Groves
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christian Groves
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Salvatore Loreto
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christian Groves
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christer Holmberg
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Schwarz, Albrecht (Albrecht)
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christer Holmberg
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Paul Kyzivat
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Paul Kyzivat
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Paul Kyzivat
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christian Groves
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christian Groves
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Paul Kyzivat
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christian Groves
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christian Groves
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Paul Kyzivat
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Paul Kyzivat
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christer Holmberg
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christer Holmberg
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christer Holmberg
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christer Holmberg
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Paul Kyzivat
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Paul Kyzivat
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christian Groves
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christian Groves
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christer Holmberg
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Makaraju, Maridi Raju (Raju)
- Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP S… Christer Holmberg