Colin Perkins

draft-ietf-mmusic-rfc4566bis

IETF DataTracker: draft-ietf-mmusic-rfc4566bis

• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol, Internet Engineering Task Force, RFC 8866, January 2021. DOI:10.17487/RFC8866
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, August 2019, Work in progress (draft-ietf-mmusic-rfc4566bis-37.txt).

• This revision specifies the multiplexing category for bandwidth attributes, and updates the IANA considerations.

• (diff from previous version)
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, June 2019, Work in progress (draft-ietf-mmusic-rfc4566bis-36.txt).

• This revision is intended to address IESG review comments. Paul Kyzivat sent a summary of the changes to the MMUSIC mailing list, but the key points are:

  • Revised normative statements that were redundant with ABNF syntax, making the text non-normative.
  • Changed some examples to use IPv6 addresses, and added additional examples using IPv6.
  • Revised sections that incorrectly referenced NTP
  • Clarified the explanation of the impact and use of a=charset
  • Revised the description of a=type to remove implication that it sometimes changes the default media direction to something other than sendrecv.
  Review is solicited, especially from those using SDP in non-offer/answer scenarios.

• (diff from previous version)
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, May 2019, Work in progress (draft-ietf-mmusic-rfc4566bis-35.txt).

• This version of the draft went to IETF last call. Changes are a further clarification that the k= field is obsolete, and that the US-ASCII subset of UTF-8 is used.

• (diff from previous version)
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, March 2019, Work in progress (draft-ietf-mmusic-rfc4566bis-34.txt).

• This version explains why the mention of private sessions was removed. It also clarifies that RTP-based systems MUST send RTCP when in recvonly mode.

• (diff from previous version)
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, February 2019, Work in progress (draft-ietf-mmusic-rfc4566bis-33.txt).

• This version addresses Ben Campbell's AD review comments.

• (diff from previous version)
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, December 2018, Work in progress (draft-ietf-mmusic-rfc4566bis-32.txt).

• Clarify that the charset-value attribute is as defined in RFC2978. Update references.

• (diff from previous version)
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, December 2018, Work in progress (draft-ietf-mmusic-rfc4566bis-31.txt).

• Clarify that attribute scopes in addition to media- and session-specific may also be defined in extensions. Minor editorial fixes.

• (diff from previous version)
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, July 2018, Work in progress (draft-ietf-mmusic-rfc4566bis-30.txt).

• This version includes some editorial clean-ups, adds some examples to show how the t=, r=, and z= lines are used, expands discussion of hierarchical encoding in m= lines, and adds additional discussion of use with ICE.

• (diff from previous version)
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, June 2018, Work in progress (draft-ietf-mmusic-rfc4566bis-29.txt).

• This version makes some minor clarifications around ABNF field names.

• (diff from previous version)
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, May 2018, Work in progress (draft-ietf-mmusic-rfc4566bis-28.txt).

• Fix typo in ABNF.

• (diff from previous version)
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, May 2018, Work in progress (draft-ietf-mmusic-rfc4566bis-27.txt).

• This version clarifies the use of "z=" time zone adjustment fields, makes the rule names in the ABNF more consistent, and makes the terminology around field names more consistent.

• (diff from previous version)
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, April 2018, Work in progress (draft-ietf-mmusic-rfc4566bis-26.txt).

• This version clarifies that the "b=" field includes transport and network later headers, but not the link layer overheads; clarifies the applicability of "r=" fields; clarifies the meaning of "udp" as a <proto> field; removes obsolete discussion about SAP; and updates the IANA considerations. These changes reflect discussion at IETF 101 in London, a few weeks ago.

• (diff from previous version)
• Ali Begen, Paul Kyzivat, Colin Perkins, and Mark Handley, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, February 2018, Work in progress (draft-ietf-mmusic-rfc4566bis-25.txt).

• This version addresses document shepherd review comments from Flemming Andreasen.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, October 2017, Work in progress (draft-ietf-mmusic-rfc4566bis-24.txt).

• This version clarifies terminology around media descriptions and session-level sections; removes an outdated Editor's Note, and updates the references and authors.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, September 2017, Work in progress (draft-ietf-mmusic-rfc4566bis-23.txt).

• This version is now very explicit that "k=" is obsolete and insecure, and MUST NOT be used.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, June 2017, Work in progress (draft-ietf-mmusic-rfc4566bis-22.txt).

• Yet another ABNF fix, from Paul Kyzivat.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, June 2017, Work in progress (draft-ietf-mmusic-rfc4566bis-21.txt).

• This version makes additional fixes to the ABNF, to address comments from Paul Kyzivat and Gunnar Hellström.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, June 2017, Work in progress (draft-ietf-mmusic-rfc4566bis-20.txt).

• This version makes further fixes to the ABNF.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, June 2017, Work in progress (draft-ietf-mmusic-rfc4566bis-19.txt).

• This version updates the ABNF, and clarifies where white-space is allowed.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, February 2017, Work in progress (draft-ietf-mmusic-rfc4566bis-18.txt).

• This version includes clarifications around the use of the "a=lang:" attributes, along with various editorial fixes.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, June 2016, Work in progress (draft-ietf-mmusic-rfc4566bis-17.txt).

• Expand discussion of IANA registration requirements for new attributes, and for updates to existing attributes.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, November 2015, Work in progress (draft-ietf-mmusic-rfc4566bis-16.txt).

• Assorted clarifications, including around "b=". Specify that RTCP MUST be sent in "a=inactive" sessions, rather than SHOULD be sent.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, May 2015, Work in progress (draft-ietf-mmusic-rfc4566bis-15.txt).

• The changes in this version are to clarify terminology, generally changing "field" to "line"; (e.g., "m= line""> clarify use of the b=CT bandwidth specifier; update the definition of a=ptime: and a=maxptime: to allow non-integer values; update the definition of a=framerate: to disallow zero framerate; clarify IANA considerations regarding ABNF additions, and new nettype and addrtype registrations; reorganise the IANA nettype and att-field registries for clarity; and to update the ABNF.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, January 2015, Work in progress (draft-ietf-mmusic-rfc4566bis-14.txt).

• This version contains further fixes to the ABNF, primarily around case sensitivity, and also updates the IANA considerations.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, January 2015, Work in progress (draft-ietf-mmusic-rfc4566bis-13.txt).

• This version updates the ABNF for the attributes.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, September 2014, Work in progress (draft-ietf-mmusic-rfc4566bis-12.txt).

• This version attempts to give more concrete syntax for the attributes it defines, and also aligns the terminology used with that in the RTP grouping taxonomy draft.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, September 2014, Work in progress (draft-ietf-mmusic-rfc4566bis-11.txt).

• This version includes a minor clarification regarding IANA registrations.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, March 2014, Work in progress (draft-ietf-mmusic-rfc4566bis-10.txt).

• This is a keep-alive version only, with no content changes.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, September 2013, Work in progress (draft-ietf-mmusic-rfc4566bis-09.txt).

• This is a keep-alive version only, with no content changes.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, March 2013, Work in progress (draft-ietf-mmusic-rfc4566bis-08.txt).

• The text regarding the session vs. media-level attribute usage has been clarified, especially around the "a=sdplang:" and "a=lang:" attributes. The behaviour of a=recvonly, a=sendrecv, a=sendonly, and a=inactive has been clarified. The case-insensitivity rules from RFC 4855 have been included.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, February 2013, Work in progress (draft-ietf-mmusic-rfc4566bis-07.txt).

• Minor editorial fixes. Note open issues around "a=sdplang:" and "a=lang:" attributes.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, August 2012, Work in progress (draft-ietf-mmusic-rfc4566bis-06.txt).

• Updates references; no content changes.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, February 2012, Work in progress (draft-ietf-mmusic-rfc4566bis-05.txt).

• Text in Section 5.2 has been revised to clarify the use of local addresses in case of ICE-like SDP extensions.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, October 2011, Work in progress (draft-ietf-mmusic-rfc4566bis-04.txt).

• Updates references and authors' addresses. No content changes.

• (diff from previous version)
• Mark Handley, Van Jacobson, Colin Perkins, and Ali Begen, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, May 2011, Work in progress (draft-ietf-mmusic-rfc4566bis-03.txt).

• The IPv4 unicast and multicast addresses in the example SDP descriptions have been revised to follow RFC 5735 and RFC 5771. Normative and informative references have been updated.

• (diff from previous version)
• Mark Handley, Van Jacobson, and Colin Perkins, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, March 2009, Work in progress (draft-ietf-mmusic-rfc4566bis-02.txt).

• This version makes several clarifications around character encoding and languages; it clarifies the scope of the session- and media-level sections; and includes assorted editorial clarifications.

• (diff from previous version)
• Mark Handley, Van Jacobson, and Colin Perkins, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, June 2008, Work in progress (draft-ietf-mmusic-rfc4566bis-01.txt).

• Keep-alive; no content changes.

• (diff from previous version)
• Mark Handley, Van Jacobson, and Colin Perkins, SDP: Session Description Protocol (.txt|.pdf), Internet Engineering Task Force, December 2007, Work in progress (draft-ietf-mmusic-rfc4566bis-00.txt).

• Initial version. This fixes the IPv6 ABNF, but is otherwise technically identical to RFC 4566.

This draft replaces draft-ietf-mmusic-sdp-new