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[MMUSIC] [Technical Errata Reported] RFC5576 (7544)

RFC Errata System <rfc-editor@rfc-editor.org> Thu, 15 June 2023 18:36 UTC

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Subject: [MMUSIC] [Technical Errata Reported] RFC5576 (7544)
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The following errata report has been submitted for RFC5576,
"Source-Specific Media Attributes in the Session Description Protocol (SDP)".

--------------------------------------
You may review the report below and at:
https://www.rfc-editor.org/errata/eid7544

--------------------------------------
Type: Technical
Reported by: Philipp Hancke <phancke@microsoft.com>

Section: 4.2

Original Text
-------------
Every <ssrc-id> listed in an "ssrc-group" attribute MUST be defined by a corresponding "ssrc:" line in the same media description

Corrected Text
--------------
Every <ssrc-id> listed in an "ssrc-group" attribute MUST be defined by a corresponding "ssrc:" line in the same media description and MUST appear only once in this ssrc-group

Notes
-----
The goal is to clarify that something like
  a=ssrc-group:FID 1234 1234
is not valid. While this is demuxable (in the BUNDLE sense) it would require chaining of ssrc-demuxing and payload type demuxing which is a lot of complexity.
The uniqueness is already implied by the following sentence (emphasis is mine):
   The SDP media attribute "ssrc-group" expresses a relationship among *several* sources of an RTP session
earlier in the section.

Instructions:
-------------
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--------------------------------------
RFC5576 (draft-ietf-mmusic-sdp-source-attributes-02)
--------------------------------------
Title               : Source-Specific Media Attributes in the Session Description Protocol (SDP)
Publication Date    : June 2009
Author(s)           : J. Lennox, J. Ott, T. Schierl
Category            : PROPOSED STANDARD
Source              : Multiparty Multimedia Session Control RAI
Area                : Real-time Applications and Infrastructure
Stream              : IETF
Verifying Party     : IESG

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