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I find this to be a really interesting example of extending network
protocols (ESMTP/MIME) in ways that their creators might have found hard
to imagine in order to create new levels of interoperability.
>Sent: Tuesday, September 10, 1996 6:38 AM
>To: The recipient's address is unknown.
>Subject: I-D ACTION:draft-ema-vpim-01.txt
> A Revised Internet-Draft is available from the on-line Internet-Drafts
> Title : Voice Profile for Internet Mail - version 2
> Author(s) : G. Vaudreuil, G. Parsons
> Filename : draft-ema-vpim-01.txt
> Pages : 43
> Date : 09/09/1996
>A class of special-purpose computers has evolved to provide voice
>services. These machines generally interface to a telephone switch and
>provide call answering and voice messaging services. Traditionally,
>messages sent to a non-local machine are transported using analog
>networking protocols based on DTMF signaling and analog voice playback.
>the demand for networking increases, there is a need for a standard
>high-quality digital protocol to connect these machines. The following
>document is a profile of the Internet standard MIME and ESMTP protocols
>use as a digital voice messaging networking protocol.
>This profile is based on an earlier effort in the Audio Message
>Specification (AMIS) group to define a voice messaging protocol based
>X.400 technology. This protocol is intended to satisfy the user
>requirements statement from that earlier work with the industry
>ESMTP/MIME mail protocol infrastructures already used within corporate
>intranets. This Internet Draft will be referred to as VPIM (Voice
>for Internet Mail) in this document. This second version of VPIM is
>on implementation experience and obsoletes RFC 1911 which describes
>version 1 of the profile.
>Internet-Drafts are available by anonymous FTP. Login with the
>"anonymous" and a password of your e-mail address. After logging in,
>type "cd internet-drafts" and then
> "get draft-ema-vpim-01.txt".
>A URL for the Internet-Draft is:
>Internet-Drafts directories are located at:
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>Send a message to: email@example.com. In the body type:
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>NOTE: The mail server at ds.internic.net can return the document in
> MIME-encoded form by using the "mpack" utility. To use this
> feature, insert the command "ENCODING mime" before the "FILE"
> command. To decode the response(s), you will need "munpack" or
> a MIME-compliant mail reader. Different MIME-compliant mail
> exhibit different behavior, especially when dealing with
> "multipart" MIME messages (i.e., documents which have been split
> up into multiple messages), so check your local documentation on
> how to manipulate these messages.
>For questions, please mail to Internet-Drafts@ietf.org
>Below is the data which will enable a MIME compliant mail reader
>implementation to automatically retrieve the ASCII version
>of the Internet-Draft.
Content-Type: Message/External-body; name="ATT00546.txt"
Content-Type: Message/External-body; name="draft-ema-vpim-01.txt.url"