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Versions: 00 01 02 RFC 2423

    Network Working Group                                   Greg Vaudreuil
    Internet Draft                                    Octel Communications
    Expires in six months                                    Glenn Parsons
    Obsoletes: RFC 1911                                  Nortel Technology
                                                          January 22, 1997
                               VPIM Voice Message
                           MIME Sub-type Registration
      Status of this Memo
      This document is an Internet Draft.  Internet Drafts are working
      documents of the Internet Engineering Task Force (IETF), its Areas,
      and its Working Groups.  Note that other groups may also distribute
      working documents as Internet Drafts.
      Internet Drafts are valid for a maximum of six months and may be
      updated, replaced, or obsoleted by other documents at any time.  It
      is inappropriate to use Internet Drafts as reference material or to
      cite them other than as a "work in progress".
      To learn the current status of any Internet-Draft, please check the
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      ftp.isi.edu (US West Coast).
      This document describes the registration of the MIME sub-type
      multipart/voice-message for use with the Voice Profile for Internet
      Mail (VPIM).  A full description of usage can be found in the VPIM
      v2 specification.
    Internet Draft         multipart/voice-message        January 22, 1997
      1.  Abstract
      This document describes the registration of the MIME sub-type
      multipart/voice-message for use with the Voice Profile for Internet
      Mail (VPIM).  A full description of usage can be found in the VPIM
      v2 specification [VPIM2].  This document refines an earlier sub-type
      registration in RFC 1911 [VPIM1].
      2. VPIM Scope
      The VPIM specification defines a restricted profile of the Internet
      multimedia messaging protocols for use between voice processing
      platforms.  These platforms have historically been special-purpose
      computers and often do not have the same facilities normally
      associated with a traditional Internet Email-capable computer.  As a
      result, VPIM also specifies additional functionality as it is
      needed.  The profile is intended to specify the minimum common set
      of features to allow interworking between compliant systems.
      3. Voice Message Interchange
      3.1 Multipart/voice-message
      The MIME sub-type multipart/voice-message is defined to hold media
      contents specific that is interchanged in messages between voice
      messaging systems described in [VPIM2].  Essentially, the sub-type
      provides a simple wrapper that easily identifies the entire content
      as being the components of a single voice message.  The sub-type is
      identical in semantics and syntax to multipart/mixed, as defined in
      [MIME2].  As such, it may be safely interpreted as a multipart/mixed
      by systems that do not understand the sub-type (only the
      identification as a voice message would be lost).
      This mechanism allows the insertion of an explanatory preamble (e.g.
      VPIM voice message attached) for recipients who read the message
      with pre-MIME software, since the preamble will be ignored by MIME-
      compliant software.
      In addition to the MIME required boundary parameter, a version
      parameter is also required for this sub-type.  This is to
      distinguish, this refinement of the sub-type from the previous
      definition in [VPIM1].  The value of the version number if the
      content conforms to the requirements of to the requirements of
      [VPIM2] is 2.  Should there be further revisions of this content
      type, there MUST be backwards compatibility (i.e. systems
      implementing version n can read version 2, and systems implementing
      version 2 can read version 2 contents within a version n.  The
      default value is 1, that is conformance to the requirements of
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    Internet Draft         multipart/voice-message        January 22, 1997
      [VPIM2] describes the restriction that only specific media types,
      applicable to voice messaging, are valid `next-level' contents of
      this sub-type (when version=2).  They are: audio/*, image/*,
      message/rfc822 and application/directory.  The multipart provides
      for the packaging of as many of these contents as is necessary.
      3.2 VPIM v2 Usage
      The multipart/voice-message sub-type is a primary component of the
      VPIM specification [VPIM2].  All VPIM Messages MUST contain this
      sub-type to identify the wrapping of a voice message.  The contents
      of this wrapper can vary from only one audio/32KADPCM content to a
      complex set of related and nested contents.
      Typically, if more than one audio segment is present, the first is
      the spoken name of the originator, the second is the spoken subject,
      and the third is the voice message itself.  This order, however,
      MUST NOT be assumed in any case.  Further, the order that the
      contents appear SHOULD be the order in which they are presented to
      the user.
      The spoken name segment, if available, shall contain the name of the
      message sender in the voice of the sender.  The length of the spoken
      name segment must not exceed 12 seconds.
      The spoken subject segment, if available, shall contain the subject
      of the message sender in the voice of the sender.  The length of the
      spoken subject segment must not exceed 20 seconds.
      The directory information part, if present, will contain information
      specific to the originator of the voice message.
      Refer to the VPIM v2 Specification for proper usage.
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    Internet Draft         multipart/voice-message        January 22, 1997
      4.  IANA Registration
           To: ietf-types@iana.org
           Subject: Registration of MIME media type multipart/voice-
           MIME media type name: multipart
           MIME subtype name: voice-message
           Required parameters: boundary, version
              The use of boundary is defined in [MIME2]
              The version parameter that contains the value "2.0" if
              enclosed content conforms to [VPIM2].  The absence of this
              parameter indicates conformance to the previous version
              defined in RFC 1911 [VPIM1].
           Optional parameters: none
           Encoding considerations: 7bit, 8bit or Binary
           Security considerations:
              This defintion introduces the enforcement of explicitly
              identifying the content as being a voice message.  In some
              environments (though likely not the majority), the loss of
              the anonymity of the content may be a security issue.
           Interoperability considerations:
              Systems developped to conform with [VPIM1] may not conform
              to this registration.  Specifically, the required version
              will likely be absent, in this case the recipient system
              should still be able to accept the message and will be able
              to handle the content.  The VPIM v1 positional
              identification, however, would likely be lost.
           Published specification: [VPIM2]
           Applications which use this media type:
              primarily voice messaging
           Additional information:
             Magic number(s): None
             File extension(s): .VIM
             Macintosh File Type Code(s): VPIM
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    Internet Draft         multipart/voice-message        January 22, 1997
           Person & email address to contact for further information:
             Glenn W. Parsons
             Gregory M. Vaudreuil
           Intended usage: COMMON
           Author/Change controller:
             Glenn W. Parsons & Gregory M. Vaudreuil
      5. Authors' Addresses
      Glenn W. Parsons
      Nortel Technology
      P.O. Box 3511, Station C
      Ottawa, ON  K1Y 4H7
      Phone: +1-613-763-7582
      Fax: +1-613-763-8385
      Gregory M. Vaudreuil
      Octel Communications
      17080 Dallas Parkway
      Dallas, TX  75248-1905
      United States
      Phone/Fax: +1-972-733-2722
      6. References
      [MIME2] N. Freed and N. Borenstein,  "Multipurpose Internet Mail
           Extensions (MIME) Part Two: Media Types ", RFC 2046, Innosoft,
           First Virtual, Nov 1996.
      [MIME4] N. Freed and N. Borenstein,  "Multipurpose Internet Mail
           Extensions (MIME) Part Four: Registration Procedures", RFC
           2048, Innosoft, First Virtual, Nov 1996.
      [VPIM1] Vaudreuil, Greg, "Voice Profile for Internet Mail", RFC
           1911, Feb 1996.
      [VPIM2] Greg Vaudreuil and Glenn Parsons, "Voice Profile for
           Internet Mail - version 2", Work in Progress, Jan 1997.
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