Internet Fax Gateway Requirements
RFC 4160

 
Document Type RFC - Informational (September 2005; No errata)
Last updated 2013-03-02
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IESG IESG state RFC 4160 (Informational)
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Responsible AD Scott Hollenbeck
Send notices to <Claudio.Allocchio@garr.it>, <tamura@toda.ricoh.co.jp>
Network Working Group                                          K. Mimura
Request for Comments: 4160                                   K. Yokoyama
Category: Informational                                         T. Satoh
                                                              C. Kanaide
                                            TOYO Communication Equipment
                                                            C. Allocchio
                                                         Consortium GARR
                                                             August 2005

                   Internet Fax Gateway Requirements

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   To allow connectivity between the General Switched Telephone Network
   facsimile service (GSTN fax) and the e-mail-based Internet Fax
   service (i-fax) an "Internet Fax Gateway" is required.  This document
   provides recommendations for the functionality of Internet Fax
   Gateways.  In this context, an "offramp gateway" provides facsimile
   data transmission from i-fax to GSTN fax; vice versa, an "onramp
   gateway" provides data transmission form GSTN fax to i-fax.  The
   recommendations in this document apply to the integrated service
   including Internet Fax terminals, computers with i-fax software on
   the Internet, and GSTN Fax terminals on the GSTN.

1.  Introduction

   An Internet Fax Gateway provides connectivity and translation between
   the General Switched Telephone Network facsimile service (GSTN fax)
   and the e-mail-based Internet Fax service (i-fax).  This document
   defines the recommended behavior of an Internet Fax Gateway.  An
   Internet Fax Gateway can be classified as "onramp", when a facsimile
   is transferred from GSTN fax to the Internet Fax, and as "offramp",
   when a facsimile is transferred from Internet Fax to GSTN fax.  For a
   more detailed definition of "onramp" and "offramp" within i-fax
   service, see [1].

Mimura, et al.               Informational                      [Page 1]
RFC 4160           Internet Fax Gateway Requirements         August 2005

   This document provides recommendations only for the specific case
   hereunder:

   1) the operational mode of the Internet Fax is "store and forward",
      as defined in Section 2.5 of [1].

   2) The format of image data is the data format defined by "simple
      mode" in [4].

   This document does not apply to the gateway functions for "real-time
   Internet Fax", as described and defined in [3].  Additional
   recommendations for optional functionality are described in [24].

1.1.  Key Words

   The key words "MUST", "SHOULD", "SHOULD NOT", and "MAY" in this
   document are to be interpreted as described in [5].

2.  Internet Fax Gateway Operations

   An onramp gateway receives a facsimile from a GSTN fax device (which
   may include an offramp gateway itself), and generates an Internet Fax
   over the Internet, which is sent to any Internet Fax device.

   An offramp gateway receives an Internet Fax over the Internet from
   any Internet Fax-capable device (which may include an onramp gateway
   or a PC), and generates a GSTN fax, which is sent to any GSTN fax
   device.

   In both of these cases, the Internet side of the gateway acts as an
   Internet Fax device, as described in [4], while the GSTN side of the
   gateway acts as a GSTN fax device, as described in [6].

   In this document we will only thus recommend the actions that occur
   while

   1) the onramp gateway converts a fax received from GSTN and forwards
      it to the Internet Fax service;

   2) the offramp gateway converts a fax received from the Internet and
      forwards it to the GSTN fax service.

Mimura, et al.               Informational                      [Page 2]
RFC 4160           Internet Fax Gateway Requirements         August 2005

3.  The Offramp Gateway Operations

   An offramp gateway MUST, as a minimal requirement, perform the
   following functions:

      - address translation/mapping,
      - image format conversion, and
      - error/return notification handling

   and MAY also perform

      - user authorization.

3.1.  User Authorization

   An offramp gateway MAY have a user authorization function to confirm
   that a user is allowed to transmit its Internet Fax to the GSTN fax
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