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[MMUSIC] [Technical Errata Reported] RFC4566 (5595)

RFC Errata System <rfc-editor@rfc-editor.org> Tue, 08 January 2019 16:43 UTC

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Subject: [MMUSIC] [Technical Errata Reported] RFC4566 (5595)
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The following errata report has been submitted for RFC4566,
"SDP: Session Description Protocol".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5595

--------------------------------------
Type: Technical
Reported by: Gavin Scallan <gscallan@vordis.com>

Section: 5

Original Text
-------------
An example SDP description is:

      v=0
      o=jdoe 2890844526 2890842807 IN IP4 10.47.16.5
      s=SDP Seminar
      i=A Seminar on the session description protocol
      u=http://www.example.com/seminars/sdp.pdf
      e=j.doe@example.com (Jane Doe)
      c=IN IP4 224.2.17.12/127
      t=2873397496 2873404696
      a=recvonly
      m=audio 49170 RTP/AVP 0
      m=video 51372 RTP/AVP 99
      a=rtpmap:99 h263-1998/90000

Corrected Text
--------------
An example SDP description is:

      v=0
      o=jdoe 2890844526 2890842807 IN IP4 10.47.16.5
      s=SDP Seminar
      i=A Seminar on the session description protocol
      u=http://www.example.com/seminars/sdp.pdf
      e=j.doe@example.com (Jane Doe)
      c=IN IP4 224.2.17.12/127
      a=recvonly
      t=2873397496 2873404696
      m=audio 49170 RTP/AVP 0
      m=video 51372 RTP/AVP 99
      a=rtpmap:99 h263-1998/90000

Notes
-----
In section 5 it indicates that the SDP lines MUST appear in the exact order given at the top of Page 9.
The order that is shown indicates that the Session Attributes  appear before the Time Description.

However in the example included in this section which explains that Media Attributes have precedence over Session Attributes for a media stream  contradicts the order as the  Session Attribute of sendonly is included below the  Time Description.

Either the example is incorrect, or the normative description is poorly explained and some variability in the order of lines in the SDP is allowed.

Instructions:
-------------
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--------------------------------------
RFC4566 (draft-ietf-mmusic-sdp-new-26)
--------------------------------------
Title               : SDP: Session Description Protocol
Publication Date    : July 2006
Author(s)           : M. Handley, V. Jacobson, C. Perkins
Category            : PROPOSED STANDARD
Source              : Multiparty Multimedia Session Control RAI
Area                : Real-time Applications and Infrastructure
Stream              : IETF
Verifying Party     : IESG

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