[MMUSIC] [Editorial Errata Reported] RFC4566 (4903)

RFC Errata System <rfc-editor@rfc-editor.org> Thu, 12 January 2017 05:04 UTC

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Subject: [MMUSIC] [Editorial Errata Reported] RFC4566 (4903)
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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=4903

--------------------------------------
Type: Editorial
Reported by: Jxck <block.rxckin.beats@gmail.com>

Section: 9

Original Text
-------------
   ; SDP Syntax
   session-description = proto-version
                         origin-field
                         session-name-field
                         information-field
                         uri-field
                         email-fields
                         phone-fields
                         connection-field
                         bandwidth-fields
                         time-fields
                         key-field
                         attribute-fields
                         media-descriptions

   connection-field =    [%x63 "=" nettype SP addrtype SP
                         connection-address CRLF]
                         ;a connection field must be present
                         ;in every media description or at the
                         ;session-level

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


Corrected Text
--------------
   ; SDP Syntax
   session-description = proto-version
                         origin-field
                         session-name-field
                         information-field
                         uri-field
                         email-fields
                         phone-fields
                         [connection-field]
                         bandwidth-fields
                         time-fields
                         key-field
                         attribute-fields
                         media-descriptions

   connection-field =    %x63 "=" nettype SP addrtype SP
                         connection-address CRLF
                         ;a connection field must be present
                         ;in every media description or at the
                         ;session-level

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


Notes
-----
in BNF of SDP, 
connection-field itself is optional [0, 1], but media-description has multiple [0,) connection-field.
it seems conflict, because multiple of optional fields doesn't finish because multiple filed can't find when to end.

so change connection-field itself not optional (remove []) and, replace session-descriptions connection-field as optional.

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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