A Simple Mode of Facsimile Using Internet Mail
RFC 2305

Document Type RFC - Proposed Standard (March 1998; No errata)
Obsoleted by RFC 3965
Last updated 2015-10-14
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Network Working Group                                         K. Toyoda
Request for Comments: 2305                                      H. Ohno
Category: Standards Track                                      J. Murai
                                                           WIDE Project
                                                                D. Wing
                                                                  Cisco
                                                             March 1998

             A Simple Mode of Facsimile Using Internet Mail

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.

SUMMARY

   This specification provides for "simple mode" carriage of facsimile
   data over the Internet.  Extensions to this document will follow.
   The current specification employs standard protocols and file formats
   such as TCP/IP, Internet mail protocols [1, 2, 3], MIME [4, 16, 17],
   and TIFF for Facsimile [5,6,19].  It can send images not only to
   other Internet-aware facsimile devices but also to Internet-native
   systems, such as PCs with common email readers which can handle MIME
   mail and TIFF for Facsimile data.  The specification facilitates
   communication among existing facsimile devices, Internet mail agents,
   and the gateways which connect them.

   The key words "MUST", "SHOULD", "SHOULD NOT", and "MAY" in this
   document are to be interpreted as described in [7].

1  SCOPE

   This specification defines a message-based facsimile communication
   over the Internet.  It describes a minimum set of capabilities,
   taking into account those of typical facsimile devices and PCs that
   can generate facsimile data.

Toyoda, et. al.             Standards Track                     [Page 1]
RFC 2305                Simple Mode of Facsimile              March 1998

   A G3Fax device has substantial restrictions due to specifications in
   the standards, such as for timers. This specification defines a
   profile for Internet mail, rather than creating a distinct "facsimile
   over the Internet" service.  The semantics resulting from the profile
   are designed to be compatible with facsimile operation over the
   general switched telephone network, so that gateways between
   facsimile and Internet mail can operate with very high fidelity.

   The reason for developing this capability as an email profile is to
   permit interworking amongst facsimile and email users.  For example
   it is intended that existing email users be able to send normal
   messages to lists of users, including facsimile-based recipients, and
   that other email recipients shall be able to reply to the original
   and continue to include facsimile recipients.  Similarly it is
   intended that existing email software work without modification and
   not be required to process new, or different data structures, beyond
   what is normal for Internet mail users.  Existing email service
   standards are used, rather than replicating mechanisms which are more
   tailored to existing facsimile standards, to ensure this
   compatibility with existing email service.

1.1 Services

   A facsimile-capable device that uses T.4 [8] and the general switched
   telephone network (GSTN) is called a "G3Fax device" in this
   specification.  An "IFax device" is an Internet- accessible device
   capable of sending, receiving or forwarding Internet faxes.  A
   message can be sent to an IFax device using  an Internet mail
   address. A message can be sent to a G3Fax device  using an Internet
   mail address; the message MAY be forwarded via an IFax offramp
   gateway.

1.2 Cases

   This specification provides for communication between each of the
   following combinations:

   Internet mail             =>  Network printer
   Internet mail             =>  Offramp gateway (forward to
                                 G3Fax)
   Network scanner           =>  Network printer
   Network scanner           =>  Offramp gateway (forward to
                                 G3Fax)
   Network scanner           =>  Internet mail

Toyoda, et. al.             Standards Track                     [Page 2]
RFC 2305                Simple Mode of Facsimile              March 1998

2  COMMUNICATION PROTOCOLS

   The set of conventions necessary to achieve facsimile- compatible
   service covers basic data transport, document data formats, message
   (document) addressing, delivery confirmation, and message security.
   In this section, the first 4 are covered.  The remainder are covered
   in following sections, along with additional details for addressing
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