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RFC 5688, "A Session Initiation Protocol (SIP) Media Feature Tag for MIME Application Subtypes", January 2010

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: rai

Errata ID: 1999
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Alfred Hoenes
Date Reported: 2010-01-10
Held for Document Update by: Robert Sparks

Section 3, 1st para says: 

   The 'sip.app-subtype' media feature tag is of type token with a case-
   insensitive equality relationship.  Its value can be any registered
|  or private MIME application subtype compliant to the subtype-name
   grammar defined in [RFC4288].  When included in the Contact header
   field of a REGISTER request, an agent SHOULD include all application
   subtypes that it can support as streaming formats.  An application
|  subtype is supported if the user agent would be capable of processing
   a Session Description Protocol (SDP) [RFC4566] offer [RFC3264] that
   contained that subtype as a format in the m-line of the SDP.

It should say:

   The 'sip.app-subtype' media feature tag is of type token with a case-
   insensitive equality relationship.  Its value can be any registered
|  or private 'application' media subtype compliant to the subtype-name
   grammar defined in [RFC4288].  When included in the Contact header
   field of a REGISTER request, an agent SHOULD include all application
   subtypes that it can support as streaming formats.  An application
|  subtype is supported if the user agent would be capable of accepting
   a Session Description Protocol (SDP) [RFC4566] offer [RFC3264] that
   contained that subtype as a format in the m-line of the SDP.

Notes:

Rationale:

For clarity, the whole paragraph is shown here, including both changes.

a) editorial; see GLOBAL Errata note, EID=1997.

b) technical: the ability of "processing" an SDP offer does not
mean the ability to _accept_ it. The latter reasonably seems
to be synonymous to "supporting" the feature contained therein,
but the former isn't. Therefore, s/processing/accepting/ .

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