Internet Draft                                        Glenn Parsons
     Expires in six months                               Nortel Networks
                                                       February 26, 1999


                           VPIM Addressing

                    <draft-ema-vpim-address-00.txt>


  Status of this Memo

     This document is an Internet-Draft and is in full conformance with
     all provisions of Section 10 of RFC2026.

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     Copyright Notice

     Copyright (C) The Internet Society (1999).  All Rights Reserved.


     Overview

     This document lists the various VPIM email addresses that are
     currently in common use and defines several new address formats for
     special case usage.

     The VPIM WG home page is:  http://www.ema.org/vpim


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     1. Abstract

     This document lists the various VPIM email addresses that are
     currently in common use and defines several new address formats for
     special case usage.

     2. Introduction

     [VPIM2] does not place any restrictions on the email address
     format.  However, it does suggest to use a numeric LHS since many
     legacy voice mail systems only use digits to identify mailboxes.
     Further, it suggests a structure to handle private, and
     international numbering plans including extensions.  This format
     has become deployed in most existing VPIM v2 systems, further some
     systems will only accept messages from addresses with a numeric LHS.

     [VPIM3] does not describe addressing at all.  The LHS format is
     left to the discretion of the mailbox owner.  However, it is useful
     in some cases (like submission or tunneling) to specify a LHS
     format.  A format based on RFC2303 is presented.

     3. VPIM v2 Addressing

     RFC 822 addresses are based on the domain name system.  This naming
     system has two components: the local part, used for username or
     mailbox identification; and the host part, used for global machine
     identification.

     As per RFC 822, the local part of the address is a US-ASCII string
     uniquely identifying a mailbox on a destination system.  For voice
     messaging, the local part is a printable string containing the
     mailbox ID of the originator or recipient.  While alphanumeric
     characters and long mailbox identifiers are permitted, most voice
     mail networks rely on numeric mailbox identifiers to retain
     compatibility with the limited 10 digit telephone keypad.  As a
     result, many voice messaging systems may only be able to handle a
     numeric local part.  The reception of alphanumeric local parts on
     these systems may result in:  the address being mapped to some
     locally unique (but confusing to the recipient) number, the address
     being deleted (but the message is still delivered), or in the worst
     case the entire message being rejected.  Or, all addresses may be
     dropped (so that a reply-all does not reach only some of the
     intended recipients). Additionally, it may be difficult
     to enter addresses on these systems with an alphanumeric local part
     without complex key sequences or some form of directory lookup.

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     In the absence of a global directory, specification of the local
     part is expected to conform to international or private telephone
     numbering plans.  It is likely that private numbering plans will
     prevail (for corporate networks) and these are left for local
     definition.  However, if the PSTN numbering plan is used (for
     corporate or public networks), it is that the public telephone
     number format be according to the international numbering plan
     described in [E.164]. The indication that the local part is a
     public telephone number is given by a preceding Ô+Õ (the Ô+Õ would
     not be entered from a telephone keypad, it is added by the system
     as a flag).  Since the primary information in the numeric scheme
     is contained by the digits, other character separators (e.g. Ô-Õ)
     may be ignored (i.e. to allow parsing of the numeric local mailbox)
     or may be used to recognize distinct portions of the telephone
     number (e.g. country code).  The specification of the local part of
     a VPIM address can be split into the four groups described below:

        1) mailbox number
            - for use as a private numbering plan (any number of
              digits)
            - e.g.  5552722@lucent.com
        2) mailbox number+extension
            - for use as a private numbering plan with extensions
              any number of digits, use of Ô+Õ as separator
            - e.g.  5552722+111@lucent.com
        3) +international number
            - for international telephone numbers conforming to E.164
               maximum of 15 digits
            - e.g.  +16137637582@nortelnetworks.com
        4)  +international number+extension
            - for international telephone numbers conforming to E.164
              maximum of 15 digits, with an extension (e.g. behind a
              PBX) that has a maximum of 15 digits.
            - e.g.  +17035245550+230@ema.org

     Deployed VPIM v2 systems typically support the first group, that is
     mailbox number on the LHS.  Note that in many cases the mailbox is
     simply the local number (e.g., in North America the 10-digit NANP
     number is used).

     4. VPIM v3 Addressing

     VPIM Version 3 places no restrictions on the form of the Internet
     address. VPIM Version 3 systems must be capable of receiving an
     arbitrary email address and generating a reply to that address.  No
     inferences about the structure of the local part (LHS) should be
     necessary.

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     Recipients email addresses must be created in a form compatible
     with the recipients system and consistent with the address entry
     capabilities of a telephone user interface (e.g., while alpha
     numerics can be entered, special characters would be difficult)

     4.1 VPIM v3 Submission LHS

     Limited capability voice mail machines may send messages by default
     to an external message submission gateway.  These gateways will
     convert the unresolved telephone number of the recipient into a
     legitimate email address.  Messages requiring address resolution
     must be sent to a submission system which will convert the
     submitted address into the routeable email address.

     Telephone numbers sent in a VPIM Version 3 submission mode MUST be
     sent in one of the following forms.

     This is based on the format defined in [PSTN-ADDR].

     4.1.1 The VPIM address

     For voice messages that are intended to be sent as VPIM messages
     the service-selector element is defined to be

           vpim-service-selector = "VPIM"

        The resultant vpim-address and vpim-mbox are formally

           vpim-address = vpim-mbox
                         [ pstn-recipient ]

           vpim-mbox = [ "VPIM=" ] ( global-phone / local-phone )
                       [ sub-addr-spec  ext-addr-spec ]

           ext-addr-spec = [ ext-sep sub-addr ]

           ext-sep = ( "/EXT=" / "+" )
                     ; note that "/EXT=" is case INSENSITIVE
                     ; "+" is used for compatibility with current
                     ; VPIM addressing

        For clarity, here is an example of a very simple vpim-mbox:

           VPIM=6137637582

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     4.1.2 The Voice address

     For voice messages that are intended to be sent as a voice
     outdialing at the destination system, the service-selector element
     is defined to be

           voice-service-selector = "VOICE"

        The resultant voice-address and voice-mbox are formally

           voice-address = voice-mbox
                         [ pstn-recipient ]

           voice-mbox = "VOICE=" ( global-phone / local-phone )
                      [ sub-addr-spec ] [post-sep post-dial]

        For more clarity, here is an example of a very simple voice-
        mbox:

           VOICE=+3940226338

     4.1.3 The AMIS address

     For voice messages that are intended to be sent as AMIS (Audio
     Messaging Interchange Specification) voice mail messages at the
     destination, the service-selector element is defined to be

           amis-service-selector = "AMIS"

        The resultant amis-address and amis-mbox are formally

           amis-address = amis-mbox
                          [ pstn-recipient ]

           amis-mbox = "AMIS=" amis-mailbox
                       [ "/SYSNUM=" amis-sysnum ]
                       ; note that "/SYSNUM=" is case INSENSITIVE


           amis-mailbox = [ amis-mailbox-numberplan ][ "+" ]
                          amis-mailbox-id [ "+" ]
                          [ amis-mailbox-extension ]
                          ; The "+" separators are used to be compatible
                          ; the X.400 AMIS-D mailbox definition --
                          ; if more than one element is present, both
                          ; "+" must appear.  Note also
                          ; that the total length of this field is
                          ; restricted to 32 characters by AMIS-D.

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           amis-mailbox-numberplan = 1*printablestring

           amis-mailbox-id = 1*16printablestring

           amis-mailbox-extension = 1*printablestring

           amis-sysnum =  ( amis-PSTN-number / amis-private-number )

           amis-PSTN-number = int-country-code "+"
                              [ area-code ] "+"
                              local-number
                             ; This is in agreement with ITU E.164 [12]
                             ; specification.  The "+" separators are
                             ; used to be compatible the X.400 AMIS-D
                             ; mailbox definition


           amis-private-number = "0++" local-number "+"
                            ; AMIS indicates that maximum permitted
                            ; length of the private number is 14 digits

        For more clarity, here is an example of a simple amis-mbox:

           AMIS=4013278144/SYSNUM=4013279542

     4.1.4 The fax address

     As defined in [FAX-ADDR]

     4.2 VPIM v3 Submission Addresses

     Based on RFC2303, these are the resultant email addresses for the
     LHS presented above.  VPIM v3 systems that support submission MUST
     accept, translate (if necessary), and forward messages sent to
     these addresses.

     4.2.1 The vpim-email

        The vpim-email element is a specific version of pstn-email for
        VPIM over the Internet e-mail transport system, where the
        service-selector distinction is set to "VPIM".

              vpim-email =  ["/"] vpim-address ["/"] "@" mta-I-pstn

        In this case the mta-I-pstn will usually point to a VPIM
        capable messaging system where the attached message will
        be delivered properly.

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     4.2.2 The voice-email

        The voice-email element is a specific version of pstn-email for
        the voice outdialing over the Internet e-mail transport system,
        where the service-selector distinction is set to "VOICE".

              voice-email =  ["/"] voice-address ["/"] "@" mta-I-pstn

        In this case the mta-I-pstn will usually point to a device
        that will perform an outdial, that is for example, make a
        telephone call to the specified number and play a voice
        attachment.


     4.2.3 The amis-email
        The amis-email element is a specific version of pstn-email for
        the AMIS over the Internet e-mail transport system, where the
        service-selector distinction is set to "AMIS".

              amis-email =  ["/"] amis-address ["/"] "@" mta-I-pstn

        In this case the mta-I-pstn will usually point to a device
        that acts as a gateway to an AMIS network where the attached
        voice message will be delivered properly.

     4.2.4 The fax-email

     As defined in [FAX-ADDR]

     5. References

     [AMIS-A] Audio Messaging Interchange Specifications (AMIS) - Analog
     Protocol Version 1, Issue 2, February 1992.

     [AMIS-D] Audio Messaging Interchange Specifications (AMIS) -
     Digital Protocol Version 1, Issue 3 August 1993.

     [E164] CCITT Recommendation E.164 (1991), Telephone Network and
     ISDN Operation, Numbering, Routing and  Mobile Service -
     Numbering Plan for the ISDN Era.

     [RFC822] Crocker, D., "Standard for the Format of ARPA Internet
     Text Messages", STD 11, RFC 822, UDEL, August 1982.

     [VPIM2] Vaudreuil, Greg, Parsons, Glenn, "Voice Profile for
     Internet Mail, Version 2", RFC 2421, September 1998.

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     [VPIM3] Vaudreuil, Greg, Parsons, Glenn, "Voice Profile for
     Internet Mail, Version 3", <draft-ema-vpimv3-00.txt>, Work in
     progress.

     [FAX-ADDR] Allocchio, C., " Minimal FAX address format in Internet
     Mail", RFC 2304, March 1998.

     [PSTN-ADDR] Allocchio, C., " Minimal PSTN address format in
     Internet Mail", RFC 2303, March 1998.

     6. Security Considerations

        None beyond those already identified in [VPIM2] and [VPIM3]

     7. Author's Address

        Glenn W. Parsons
        Nortel Networks
        P.O. Box 3511, Station C
        Ottawa, ON K1Y 4H7

        Phone: +1-613-763-7582
        Fax: +1-613-763-4461
        Email: gparsons@nortelnetworks.com

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