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Network Working Group G. Vaudreuil Request for Comments: 2423 Lucent Technologies Obsoletes: 1911 G. Parsons Category: Standards Track Northern Telecom

                                                          September 1998
                         VPIM Voice Message
                     MIME Sub-type Registration

Status of this Memo

 This document specifies an Internet standards track protocol for the
 Internet community, and requests discussion and suggestions for
 improvements.  Please refer to the current edition of the "Internet
 Official Protocol Standards" (STD 1) for the standardization state
 and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

 Copyright (C) The Internet Society (1998).  All Rights Reserved.


 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

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 revises 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.

Vaudreuil & Parsons Standards Track [Page 1] RFC 2423 multipart/voice-message September 1998

 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
 document are to be interpreted as described in [REQ].

3. Voice Message Interchange

3.1 multipart/voice-message

 The MIME sub-type multipart/voice-message is defined to hold specific
 media contents that are 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 parameter is "2.0"
 if the content conforms to the requirements of [VPIM2].  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 version value (when the parameter
 is missing) is 1, indicating the content conforms to the requirements
 of [VPIM1].
 [VPIM2] describes the restriction that only specific media types,
 applicable to voice messaging, are valid `next-level' contents of
 this sub-type (when version=2.0).  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.

Vaudreuil & Parsons Standards Track [Page 2] RFC 2423 multipart/voice-message September 1998

 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 orginator of the voice message.
 Refer to the VPIM v2 Specification for details on proper usage.

4. IANA Registration

 Subject: Registration of MIME media type
 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 definition identifies 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.

Vaudreuil & Parsons Standards Track [Page 3] RFC 2423 multipart/voice-message September 1998

 Interoperability considerations:
    Systems developed 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:
     This document
 Applications which use this media type:
   Primarily voice messaging
 Additional information:
   Magic number(s): ?
   File extension(s): .VPM
   Macintosh File Type Code(s): VPIM
 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

Vaudreuil & Parsons Standards Track [Page 4] RFC 2423 multipart/voice-message September 1998

5. Authors' Addresses

 Glenn W. Parsons
 Northern Telecom
 P.O. Box 3511, Station C
 Ottawa, ON  K1Y 4H7
 Phone: +1-613-763-7582
 Fax: +1-613-763-4461
 Gregory M. Vaudreuil
 Lucent Technologies
 17080 Dallas Parkway
 Dallas, TX  75248-1905
 United States
 Phone/Fax: +1-972-733-2722
 EMail: GregV@Lucent.Com

6. References

 [MIME2] Freed, N., and N. Borenstein,  "Multipurpose Internet Mail
         Extensions (MIME) Part Two: Media Types ", RFC 2046, November
 [MIME4] Freed, N., Klensin, J., and J. Postel, "Multipurpose Internet
         Mail Extensions (MIME) Part Four: Registration Procedures",
         RFC 2048, November 1996.
 [VPIM1] Vaudreuil, G., "Voice Profile for Internet Mail", RFC 1911,
         February 1996.
 [VPIM2] Vaudreuil, G., and G. Parsons, "Voice Profile for Internet
         Mail - version 2", RFC 2421, September 1998.
 [REQ] Bradner, S., "Key words for use in RFCs to Indicate Requirement
       Levels", BCP 14, RFC 2119, March 1997.

Vaudreuil & Parsons Standards Track [Page 5] RFC 2423 multipart/voice-message September 1998

7. Full Copyright Statement

 Copyright (C) The Internet Society (1998).  All Rights Reserved.
 This document and translations of it may be copied and furnished to
 others, and derivative works that comment on or otherwise explain it
 or assist in its implmentation may be prepared, copied, published and
 distributed, in whole or in part, without restriction of any kind,
 provided that the above copyright notice and this paragraph are
 included on all such copies and derivative works.  However, this
 document itself may not be modified in any way, such as by removing
 the copyright notice or references to the Internet Society or other
 Internet organizations, except as needed for the purpose of
 developing Internet standards in which case the procedures for
 copyrights defined in the Internet Standards process must be
 followed, or as required to translate it into languages other than
 The limited permissions granted above are perpetual and will not be
 revoked by the Internet Society or its successors or assigns.
 This document and the information contained herein is provided on an

Vaudreuil & Parsons Standards Track [Page 6]

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