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RFC2423 - VPIM Voice Message MIME Sub-type Registration

王朝other·作者佚名  2008-05-31
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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.

Overview

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.

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 RFC1911 [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.

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 [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.

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

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 [VPIM2]. The absence of this

parameter indicates conformance to the previous version

defined in RFC1911 [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

[VPIM2]

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

Glenn.Parsons@Nortel.ca

Gregory M. Vaudreuil

Greg.Vaudreuil@Octel.Com

Intended usage: COMMON

Author/Change controller:

Glenn W. Parsons & Gregory M. Vaudreuil

5. Authors' Addresses

Glenn W. Parsons

Northern Telecom

P.O. Box 3511, Station C

Ottawa, ON K1Y 4H7

Canada

Phone: +1-613-763-7582

Fax: +1-613-763-4461

EMail: Glenn.Parsons@Nortel.ca

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 ", RFC2046, November

1996.

[MIME4] Freed, N., Klensin, J., and J. Postel, "Multipurpose Internet

Mail Extensions (MIME) Part Four: Registration Procedures",

RFC2048, November 1996.

[VPIM1] Vaudreuil, G., "Voice Profile for Internet Mail", RFC1911,

February 1996.

[VPIM2] Vaudreuil, G., and G. Parsons, "Voice Profile for Internet

Mail - version 2", RFC2421, September 1998.

[REQ] Bradner, S., "Key words for use in RFCs to Indicate Requirement

Levels", BCP 14, RFC2119, March 1997.

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

English.

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

"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING

TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING

BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION

HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF

MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE."

 
 
 
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