Voice Profile for Internet Mail - version 2 (VPIMv2)
RFC 3801

Document Type RFC - Draft Standard (June 2004; No errata)
Obsoletes RFC 2423, RFC 2421
Last updated 2015-10-14
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IESG IESG state RFC 3801 (Draft Standard)
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Network Working Group                                       G. Vaudreuil
Request for Comments: 3801                           Lucent Technologies
Obsoletes: 2421                                               G. Parsons
Category: Standards Track                                Nortel Networks
                                                               June 2004

         Voice Profile for Internet Mail - version 2 (VPIMv2)

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 (2004).

Abstract

   This document specifies a restricted profile of the Internet
   multimedia messaging protocols for use between voice processing
   server platforms.  The profile is referred to as the Voice Profile
   for Internet Mail (VPIM) in this document.  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.  This profile is intended to specify
   the minimum common set of features to allow interworking between
   conforming systems.

   This document obsoletes RFC 2421 and describes version 2 of the
   profile with greater precision.  No protocol changes were made in
   this revision. A list of changes from RFC 2421 are noted in Appendix
   F.  Appendix A summarizes the protocol profiles of this version of
   VPIM.

Vaudreuil & Parsons         Standards Track                     [Page 1]
RFC 3801                         VPIMv2                        June 2004

Table of Contents

   1.   Introduction...................................................3
        1.1.  Voice Messaging System Limitations.......................3
        1.2.  Design Goals.............................................4
        1.3.  Applicability for VPIM...................................5
   2.   Requirements Language..........................................5
   3.   Protocol Restrictions..........................................6
   4.   Voice Message Interchange Format...............................6
        4.1.  VPIM Message Addressing Formats..........................7
        4.2.  Message Header Fields....................................9
        4.3.  MIME Audio Content Descriptions.........................17
        4.4.  Voice Message Content Types.............................19
        4.5.  Other MIME Contents.....................................23
        4.6.  Delivery Status Notification (DSN)......................25
        4.7.  Message Disposition Notification (MDN)..................26
        4.8.  Forwarded Messages......................................26
        4.9.  Reply Messages..........................................27
   5.   Message Transport Protocol....................................27
        5.1.  Base SMTP Protocol......................................28
        5.2.  SMTP Service Extensions.................................28
        5.3.  ESMTP - SMTP Downgrading................................30
   6.   Directory Address Resolution..................................30
   7.   Management Protocols..........................................30
        7.1.  Network Management......................................31
   8.   Conformance Requirements......................................31
   9.   Security Considerations.......................................32
        9.1.  General Directive.......................................32
        9.2.  Threats and Problems....................................32
        9.3.  Security Techniques.....................................33
   10.  Normative References..........................................33
   11.  Acknowledgments...............................................36
   12.  Appendix A - VPIM Requirements Summary........................37
   13.  Appendix B - Example Voice Messages...........................43
   14.  Appendix C - Example Error Voice Processing Error Codes.......49
   15.  Appendix D - Example Voice Processing Disposition Types.......50
   16.  Appendix E - IANA Registrations...............................50
        16.1.  Voice Content-Disposition Parameter Definition.........51
        16.2.  Multipart/Voice-Message MIME Media Type Definition.....51
   17.  Appendix F - Change History: RFC 2421 (VPIM V2) To This Doc...53
   18.  Authors' Addresses............................................54
   19.  Full Copyright Statement......................................55

Vaudreuil & Parsons         Standards Track                     [Page 2]
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