[MMUSIC] [Technical Errata Reported] RFC4566 (3278)

RFC Errata System <rfc-editor@rfc-editor.org> Tue, 03 July 2012 18:02 UTC

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Subject: [MMUSIC] [Technical Errata Reported] RFC4566 (3278)
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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_search.php?rfc=4566&eid=3278

--------------------------------------
Type: Technical
Reported by: Riccardo Bernardini <riccardo.bernardini@uniud.it>

Section: 5

Original Text
-------------
At page 9:


      Media description, if present
         m=  (media name and transport address)

Corrected Text
--------------

      Media description, if present
         m=* (media name and transport address)



Notes
-----
A '*' is added making "m=" lines optional

Rationale: 
The description about media lines in section 5, page 9 is conflicting with the ABNF syntax of media-description in Section 9, page 40

media-descriptions =  *( media-field
                         information-field
                         *connection-field
                         bandwidth-fields
                         key-field
                         attribute-fields )

According to the ABNF grammar, an SDP description can have zero "m=" lines, but according to the description at page 9, at least one line must be present.  Note that the conflict could be solved also by replacing the media-descriptions definition with 

   media-descriptions =  1*( media-field ... )

but at page 8 (still Section 5) it is said

   An SDP session description consists of a session-level section
   followed by zero or more media-level sections. ...
               ^^^^^^^^^^^^^^^^^^^^^^^^

so, I guess that the ABNF grammar is correct.

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RFC4566 (draft-ietf-mmusic-sdp-new-26)
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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
Area                : Real-time Applications and Infrastructure
Stream              : IETF
Verifying Party     : IESG