[MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP SDP syntax question
Christian Groves <Christian.Groves@nteczone.com> Tue, 30 September 2014 12:13 UTC
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Date: Tue, 30 Sep 2014 22:12:59 +1000
From: Christian Groves <Christian.Groves@nteczone.com>
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Subject: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP SDP syntax question
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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. Also "space" should be SP to be consistent with RFC4566. To address these I suggest the following update: e.g. sctp-m-line = %x6d "=" ("application" space sctp-port space "SCTP" 1*(SP sctp-fmt) CRLF) / ("application" space sctp-port space "SCTP/DTLS" 1*(SP sctp-fmt) CRLF) / ("application" space udp-port space "DTLS/SCTP" 1*(SP sctp-fmt) CRLF) sctp-port = port sctp-fmt = association-usage association-usage = token 2) Cl. 4.1.1 sctp-port: The syntax for sctp-port indicates the dual use of "=", i.e. sctp-port-attr = "a=sctp-port=" portnumber port-number = port That doesn't appear to be consistent with the example in clause 4 which has: a=sctp-port 4060 To match that the syntax needs to be updated, something like: sctp-port-attr = "a=sctp-port" SP portnumber port-number = port I'm not sure why "portnumber" is used when "port" is commonly used in clause 4.1? The syntax could be simplified to: sctp-port-attr = "a=sctp-port" SP port 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? 4) Cl.4.1.2: The last sentence of the 1st paragraph and the first sentence of the second paragraph appears to be a repeat. 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? 6) Cl.4, 4.1 and 10 refer to the <fmt> sub-field. These should be updated to refer to the <sctp-fmt> field. 7) Cl.10: How will this registry relate to the “WebSocket Subprotocol Name Registry” (http://www.iana.org/assignments/websocket/websocket.xml#subprotocol-name)? 8) Cl.8.2: What's the significance of the the "*" in the examples in terms of "association usage"? Regards, Christian
- [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