Network Working Group Greg Vaudreuil Internet Draft Lucent Technologies Document: Glenn Parsons Obsoletes: RFC 2423 Nortel Networks Category: Standards Track November 16, 2000 VPIM Voice Message MIME Sub-type Registration Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. 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 draft documents 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 "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. 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]. This document obsoletes RFC 2423. 2. Conventions used in this document The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC-2119. 3. 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 Expires: 16/05/01 1 multipart/voice-message November 16, 2000 4. Voice Message Interchange 4.1 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 [VPIM2R2]. 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 [VPIM2R2]. Should here 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]. [VPIM2R2] 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 applicationtext/directory. The multipart provides or 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 [VPIM2R2]. 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. Vaudreuil & Parsons Expires: 16/05/01 2 multipart/voice-message November 16, 2000 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 details on proper usage. 4. IANA Registration To: ietf-types@iana.org Subject: Registration of MIME media type multipart/voice-message 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 [VPIM2R2]. 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. 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 [VPIM2R2] [VPIM2] Applications which use this media type: Vaudreuil & Parsons Expires: 16/05/01 3 multipart/voice-message November 16, 2000 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 gparsons@nortelnetworks.com Gregory M. Vaudreuil gregv@lucent.com Intended usage: COMMON Author/Change controller: Glenn W. Parsons & Gregory M. Vaudreuil 5. Security Considerations Most security considerations are described in [VPIM2R2]. 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. In addition, implementors should be aware that they may receive invalid content in a mulitpart/voice-message that cannot be processed or stored. This SHOULD NOT compromise the integrity of the valid contents of message. 6. References [V-MSG] G. Vaudreuil and G. Parsons, "VPIM Voice Message MIME Sub- type Registration", RFC 2423, September 1998. [MIME2] Freed, N., and N. Borenstein, "Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types ", RFC 2046, November 1996. [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. [VPIM2R2] Vaudreuil, G., and G. Parsons, "Voice Profile for Internet Mail - version 2", , November 2000. Vaudreuil & Parsons Expires: 16/05/01 4 multipart/voice-message November 16, 2000 11. Author's Addresses Glenn W. Parsons Nortel Networks P.O. Box 3511, Station C Ottawa, ON K1Y 4H7 Canada Phone: +1-613-763-7582 Fax: +1-416-597-7005 EMail: gparsons@nortelnetworks.com Gregory M. Vaudreuil Lucent Technologies 17080 Dallas Parkway Dallas, TX 75248-1905 United States Phone/Fax: +1-972-733-2722 EMail: gregv@lucent.com Vaudreuil & Parsons Expires: 16/05/01 5 multipart/voice-message November 16, 2000 8. Full Copyright Statement Copyright (C) The Internet Society (2000). All Rights Reserved. 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