rfc1703.txt

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   forward indirection, so that messages may go through any number of
   relays (and/or gateways).  This may introduce arbitrarily large
   delays of minutes, hours, or days.

   A client that configures their Internet attachment to permit "direct"
   SMTP connectivity to a radio paging server will be able to submit
   paging requests to the server directly, without additional SMTP-
   relaying. That is, transmission from radio paging client to server
   will be one "SMTP-hop"only.  This will eliminate any possibility of
   non-deterministic delay by the Internet itself.

   The combination of configuring radio paging server and client to
   allow direct IP/SMTP-level interaction and ensuring that they use
   SEND or SAML commands only will mean that a client receiving a
   positive reply from the server is assured that the page has been sent
   on the radio paging network.

4.  Usage Examples

   These examples make use of the "iddd.tpc.int" subdomain.  The DNS
   servers for this subdomain, upon encountering a domain of the form:

        NUMBER.iddd.tpc.int




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RFC 1703          Radio Paging -- Technical Procedures      October 1994


   automatically create a CNAME RR of the form:

        R.E.B.M.U.N.iddd.tpc.int

   e.g.,

        14159408776.iddd.tpc.int

   will be treated as

        6.7.7.8.0.4.9.5.1.4.1.tpc.int

4.1.  A MIME Example

     To: [e-mail]
     cc: Marshall Rose <[e-mail]>
     From: Carl Malamud <[e-mail]>
     Date: Thu, 22 Jul 1993 08:38:00 -0800
     Subject: First example, for an alphanumeric pager
     Message-ID: <[e-mail]>
     MIME-Version: 1.0
     Content-Type: text/plain; charset=us-ascii

     A brief textual message sent to the radio paging network
     having an IXO access telephone number of "[phone]"
     to the radio pager having a PIN of "98765".

4.2.  A Non-MIME Example

     To: [e-mail]
     From: Carl Malamud <[e-mail]>
     Date: Thu, 22 Jul 1993 08:38:00 -0800
     Subject: Second example, for a numeric pager
     Message-ID: <[e-mail]>

     2026282044

5.  Server Configuration Example

   A hypothetical radio paging carrier, e.g.,

     Pigeon Paging

   might choose to integrate its radio paging services with Internet e-
   mail in the following fashion:






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RFC 1703          Radio Paging -- Technical Procedures      October 1994


   (1)  The radio paging carrier establishes a top-level domain name,
        e.g.,

             pigeon.net

   (2)  The radio paging carrier installs and operates one or more
        radio paging servers, each having a unique entry in the DNS,
         e.g.,

             ixo1.pigeon.net.              IN A  a.b.c.d

        Each of these radio paging servers runs an SMTP server which
        implements the SEND command as described in Section 3.3 above.

   (3)  The radio paging carrier coordinates with the administrators of
        the TPC.INT subdomain to have the appropriate MX records added
        to the DNS, assigning cost values in the MX records to reflect
        any difference in the quality of service between the radio
        paging servers, e.g.,

             4.3.2.1.5.5.5.0.0.8.1.tpc.int. IN MX  5 ixo1.pigeon.net.
             4.3.2.1.5.5.5.0.0.8.1.tpc.int. IN MX  5 ixo2.pigeon.net.

        which would provide both load-balancing and redundancy
        (particularly if the servers were located at different points in
        the Internet).  At this point, messages can be sent using the
        addressing formats described in Section 2.2 above.

   (4)  The radio paging carrier may choose to make available a client
        program which uses the SMTP SEND command, in order to achieve
        "real-time" delivery of messages into the radio paging network.

   (5)  Finally, the radio paging carry may choose to assign each of its
        customers a mailbox, e.g.,

             [e-mail]

        which maps to the TPC.INT address for the customer's radio pager.

        The system(s) listed in the DNS for this domain would maintain
        the appropriate mail aliases for this mapping, e.g.,

             R: 220 pager.pigeon.net SMTP ready
             S: HELO malamud.com
             R: 220 pager.pigeon.net
             S: EXPN mrose
             R: 250 <[e-mail]>




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RFC 1703          Radio Paging -- Technical Procedures      October 1994


        At the carrier's discretion, these systems may also be the
        systems running the radio paging servers.  However, this needn't
        be the case.  For example, consider a situation where a client
        program which uses the SMTP SEND command, wants to ensure that it
        is talking to radio paging server for an address: e.g.,

             R: 220 pager.pigeon.net SMTP ready
             S: EHLO malamud.com
             R: 220-pager.pigeon.net
             R: 220 SEND
             S: VRFY mrose
             R: 551 User not local;
                     try <[e-mail]>

        or

             R: 220 pager.pigeon.net SMTP ready
             S: EHLO malamud.com
             R: 220-pager.pigeon.net
             R: 220 SEND
             S: VRFY mrose
             R: 250 <[e-mail]>

6.  Security Considerations

   Internet mail may be subject to monitoring by third parties, and in
   particular, message relays.

7.  Acknowledgements

   This document was motivated by RFC 1568 [6] and RFC 1645 [7].  In
   addition, David Crocker, Carl Malamud, and Perry Metzger also
   provided substantive comments.

8.  References

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

   [2] Partridge, C., "Mail Routing and the Domain System", BBN
       Laboratories, STD 14, RFC 974, BBN, January 1986.

   [3] Mockapetris, P., "Domain Names -- Concepts and Facilities", STD
       13, RFC 1034, USC/Information Sciences Institute, November 1987.

   [4] Mockapetris, P., "Domain Names -- Implementation and
       Specification", STD 13, RFC 1035, USC/Information Sciences
       Institute, November 1987.



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RFC 1703          Radio Paging -- Technical Procedures      October 1994


   [5] Borenstein, N., and N. Freed, "MIME: Mechanisms for Specifying
       and Describing the Format of Internet Message Bodies", RFC 1521,
       Bellcore, Innosoft, September 1993.

   [6] Gwinn, A., "Simple Network Paging Protocol - Version 1(b)", RFC
       1568, Southern Methodist University, January 1994.

   [7] Gwinn, A., "Simple Network Paging Protocol - Version 2", RFC
       1645, Southern Methodist University, July 1994.

9.  Author's Address

       Marshall T. Rose
       Dover Beach Consulting, Inc.
       420 Whisman Court
       Mountain View, CA  94043-2186
       US

       Phone: [phone]
       Fax:   [phone]
       EMail: [e-mail]






























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