Fax Working Group                                             Toru Maeda
Internet Draft                                                 CANON Inc
Expires: September 1998                                    10 March 1998



             Extended MDN for Internet Fax Full Mode

               draft-ietf-fax-mdn-fullmode-00.txt


Status of this memo

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documents  of the Internet Engineering Task Force (IETF), its areas,
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Abstract

This memo defines an additional MIME content-type defined in Message
Disposition Notifications (MDN) that may be used by a mail user agent
(UA) which is capable of Internet Fax Full Mode with Capabilities
exchange and Confirmation of receipt. This content-type is intended to
be machine-processable. Additional message headers are also defined to
permit that the sender (of the message) requires Message Disposition
Notifications (MDNs). MDN is "An Extensible Message Format for Message
Disposition Notification" in draft-ietf-receipt-mdn-07.txt










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Table of Contents

1.      Introduction ...........................................3

2.      Method of capability exchange and confirmation .........5

3.      Capability exchange phase ..............................6

4.      Message transmission and confirmation phase ............9

5.      Security considerations ...............................14

6.      Collected Grammar .....................................16

7.      Example ...............................................21

8.      Acknowledgments .......................................24

9.      References ............................................24

10.     Copyright .............................................25

11.     Author's Address ......................................25




























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1. Introduction

This memo defines an additional MIME content-type for extended message
disposition notifications (MDNs) for Intenet FAX Full Mode. MDN is
defined in "An Extensible Message Format for Message Disposition
Notification" in draft-ietf-receipt-mdn-07.txt [3]. Internet FAX Full
Mode which has capability echange and confirmation is defined in
ITU-T F.Ifax [7] and T.Ifax1 [8]. An extended MDN can be used to
exchange Internet FAX recipient capabilities and to notify the sender
of a message of any of several conditions that may occur after
successful delivery, such as reception of the Internet FAX Full Mode
or the recipient error in process of the Internet FAX Full Mode. An
extended MDN will be used for terminal to terminal capabilities
exchange and confirmation in Internet FAX Full Mode. Capability
exchange more than Internet FAX and TIFF-FX such as MS Word
application and PDF file are out of scope. The
"message/disposition-notification" content-type defined herein is
intended for use within the framework of the "multipart/report"
content type defined in RFC 1892 [6].

Internet FAX Full Mode is defined in F.Ifax [7] as follows;

(a)     Capabilities of the terminals are exchanged.

(b)     An acknowledgement of receipt is exchanged between gateways
        and may be transfered from the receiving terminal to sending
        terminal

(c)     The contents of standard messages used by the transmitting
        terminal are preserved

This memo defines the format of the capability exchange and
confirmation for Internet FAX Fullmode and the RFC 822 headers used
to request them.

The key words "MUST","MUST NOT","REQUIRED","SHALL","SHALL NOT",
"SHOULD","SHOULD NOT","RECOMENDED","MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [4].

New parameters of Disposition-Notification-Option header, modifier,
field are writen with prefix "G3Fax-" to make clear the extension
from MDN. These parameters will be registered to IANA.








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1.1     Purposes

The extended MDNs defined in this memo are expected to serve
several purposes:

(a)     Allow a sender of Internet FAX Full Mode to request
        capabilities of recipient's Internet FAX Full Mode in terminal
        to terminal communication;

(b)     Notify capabilities of recipient's Internet FAX Full Mode to
        the sender of Internet FAX Full Mode.

(c)     Allow a sender of Internet FAX Full Mode to send image using
        full function of TIFF-FX based on notified capabilities of
        recipient's Internet FAX Full Mode, to send command and to
        request report of recipient's Internet FAX Full Mode;

(d)     Notify report of recipient's Internet FAX Full Mode to the
        sender of Internet FAX Full Mode with part of received message,
        and may notify capabilities

(e)     Inform human beings of the disposition of messages after
        Successful delivery of Internet FAX Full Mode message, in a
        manner which is largely independent of human language;

(f)     Allow Language-independed, yet reasonably precise, indications
        of the disposition of a message to be delivered in Internet
        FAX Full Mode.


1.2     Requirements

These purposes place the following constraints on the capability
exchange and confirmation protocol:

(a)     It must be readable by humans as being machine parsable.

(b)     It must be provide enough information to allow Internet FAX
        Full Mode message senders to unambiguously associate an MDN
        with the message that was sent and the original recipient
        address for which the MDN is issued.

(c)     It must also be able to describe the disposition of a Internet
        FAX Full Mode message independent of any particular human
        language or of the terminology of any particular mail system.

(d)     The specification must be extensible in order to accommodate
        future requirements of Internet FAX Full Mode.


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2.  Method of capability exchange and confirmation

A communication between Internet FAX Full Mode machines consists of
two phases that are the capability exchange phase and the message
transmission and confirmation phase. In the capability exchange phase,
a sender of Internet FAX Full Mode sends capability request message
using extended MDN. A recipient of Internet FAX Full Mode must
immediately return message with its capabilities using extended MDN.
In the message transmission and confirmation phase, based on this
reply messages, the sender sends message, command data and confirmation
request using extended MDN. The recipient must immediately returns
confirmation message after the processing of image  using extended MDN.
The confirmation message includes human readable message, completion
code, total received page, error page numbers, partial or full
received message and capabilities of recipient. Capability exchange
phase and message transmission and confirmation phase are independent,
and not required to succeeded. A sender may perform capability
exchange phase only when capabilities of the destination is registered
in machine, and perform the message transmission and confirmation
phase for every transmission.





























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3.  Capability exchange phase

A sender of Internet FAX Full Mode sends a capability request message
using extended MDN. A recipient of Internet FAX Full Mode must
immediately return a message with capabilities of Internet FAX Full
Mode using extended MDN. Capabilities of Internet FAX Full Mode is
expressed using FCF and FIF in CCITT T.30 [5].


3.1     Capability request message

Capability request message is requested by including a Disposition-
Notification-To and Disposition Notification-Options headers in the
message. Further information to be used by the recipient Internet FAX
Full Mode in generating the capability request may be provided by
including Original-recipient in the message.

A message that contains capability request, should contain a Message-ID
header as specified in RFC 822[2].


3.1.1 Disposition-Notification-To Header

A request that the receiving Internet FAX Full mode issue capability
is made by placing a Disposition-Notification-To header into the
message.


3.1.2 Disposition-Notification-Options Header

Disposition-Notification-Options header provides a request of
capability exchange in Internet FAX Full Mode.

     Disposition-Notification-Options =
        "Disposition-Notification-Options" ":"
                disposition-notification-parameters

     disposition-notification-parameters =
                parameter *(";" parameter)

     parameter = "G3Fax-capability-request" "=" "required"


3.1.3 Message-ID

A message that contains capability request for Internet FAX Full Mode
should contain a Message-ID header as specified in RFC 822[2].



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3.2 capability response

A capability response message is a MIME message with a top level
content-type of multipart/report (defined in RFC 1892 [6]).

(a)     The report-type parameter of the multipart/report content is
        "disposition-notification".

(b)     The first component of the multipart/report contains a human
        readable explanation of the MDN, as described in RFC 1892 [6].

(c)     The second component of  the multipart/report is of
        content-type message/disposition-notification, described in
        section of this document.

The capability response must be addressed to the address from the
Disposition-Notification-To header from the original message for which
the capability response is being generated.

The From filed of the message header of the capability response must
contain the address of the Internet FAX Full Mode machine for which
capability response is being issued.


3.2.1 The message/disposition-notification content-type

The message/disposition-notification content-type for capability
response message is defined as follows:

    MIME type name:             message
    MIME subtype name:          disposition-notification
    Optional parameters:        none
    Encoding considerations:    "7bit" encoding is sufficient and
                                MUST be used.
    Security considerations:    will be discussed$B!!(J

The syntax of the message/disposition-notification content is
as follows:

    disposition-notification-content = [ reporting-ua-field CRLF ]
          [ mdn-gateway-field CRLF ]
          [ original-recipient-field CRLF ]
          final-recipient-field CRLF
          original-message-id-field CRLF
          disposition-field CRLF
          *( failure-field CRLF )
          *( error-field CRLF )
          *( warning-field CRLF )
          *( extension-field CRLF )

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3.2.2 Final-Recipient-field

The Final-Recipient field indicates the recipient for which the
capability response is being issued.


3.2.3 Original-message-ID

The Original-Message-ID field indicates the message-ID of the message
for which the capability response is being issued. This field must be
present.


3.2.4 Disposition-field

The Disposition filed indicates the action performed by the recipient
of Internet FAX Full Mode. This filed must be present.
Disposition-modifier$B!J(J G3Fax-capability-request$B!K(J will be used for
capability response.

The syntax for the Disposition filed is:

        Disposition: automatic-action/MDN-sent-Automatically
                ; processed / G3Fax-capability-request


3.2.5 Extension-field

Additional MDN field is defined for capability response.  Capabilities
of recipient is expressed using FCF and FIF in T30 frame format [5].

        field = "G3Fax-t30frame" ":" G3Fax-t30frame-field

        G3Fax-t30frame-field = parameter * ( ";" parameter )

        parameter = "G3Fax-t30frame-parameter"

        G3Fax-t30frame-parameter =
                "G3Fax-t30frame" "=" t30-fcf [ "," t30-fif ]











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4.  message transmission and confirmation phase

The sender transmits message, command data and confirmation request
based on previously received messages from the recipient Internet FAX
Full Mode using extended MDN. The recipient returns confirmation
message immediately after the processing of image  using extended MDN.
The confirmation message includes human readable message, completion
code, total received page, error page numbers, part or full message of
received and capabilities of recipient.


4.1  message

The sender sends message, command data and confirmation request based
on previous knowledge of recipient Internet FAX Full Mode using
extended MDN.




4.2  Capability request message

Capability request message is requested by including a Disposition-
Notification-To and Disposition Notification-Options headers in the
message. Further information to be used by the recipient Internet FAX
Full Mode in generating the capability request may be provided by
including Original-recipient in the message.

A message that contains capability request, should contain a
Message-ID header as specified in RFC 822[2].


4.2.1 Disposition-Notification-To Header

A request that the receiving Internet FAX Full mode issue confirmation
is made by placing a Disposition-Notification-To header into the
message.













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4.2.2 Disposition-Notification-Options Header

Disposition-Notification-Options header provides a request of
confirmation and command in Internet FAX Full Mode. Command is
expressed using FCF and FIF defined in CCITT T.30 frame[5].

$B!!!!!!(JDisposition-Notification-Options =
        "Disposition-Notification-Options" ":"
                disposition-notification-parameters

     disposition-notification-parameters = parameter *(";" parameter)

     parameter = "G3Fax-report-request" "=" "required"

     parameter = "G3Fax-frame" "=" t30-fcf [ "," t30-fif ]


4.2.3 Message-ID

A message that contains confirmation request for Internet FAX Full Mode
should contain a Message-ID header as specified in RFC 822 [2].





























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4.3  confirmation

A confirmation message is a MIME message with a top level content-type
of multipart/report (defined in RFC 1892 [6]).

(a)     The report-type parameter of the multipart/report content is
        "disposition-notification".

(b)     The first component of the multipart/report contains a human
        readable explanation of the MDN, as described in RFC 1892.

(c)     The second component of  the multipart/report is of content-
        type message/disposition-notification, described in section
        of this document.

(d)     If the original message or a portion of the message or report
        is to be returned to the sender. The decision of whether or
        not to return the message or report is up to the Internet FAX
        Full Mode recipient.

The confirmation must be addressed to the address from the Disposition-
Notification-To header from the original message for which the
confirmation is being generated.

The From filed of the message header of the confirmation must contain
the address of the Internet FAX Full Mode machine for which
confirmation is being issued.























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4.3.1 The message/disposition-notification content-type
The message/disposition-notification content-type for confirmation
message is defined as follows:

    MIME type name:             message
    MIME subtype name:          disposition-notification
    Optional parameters:        none
    Encoding considerations:    "7bit" encoding is sufficient and
                                MUST be used.
    Security considerations:    will be discussed$B!!(J


The syntax of the message/disposition-notification content is
as follows:

     disposition-notification-content = [ reporting-ua-field CRLF ]
          [ mdn-gateway-field CRLF ]
          [ original-recipient-field CRLF ]
          final-recipient-field CRLF
          original-message-id-field CRLF
          disposition-field CRLF
          *( failure-field CRLF )
          *( error-field CRLF )
          *( warning-field CRLF )
          *( extension-field CRLF )

4.3.2  final-recipient-field

The Final-Recipient field indicates the recipient of Internet FAX for
which the confirmation is being issued.


4.3.3  Original-message-ID
The Original-Message-ID field indicates the message-ID of the message
for which the confirmation is being issued. This field must be present.


4.3.4  disposition-field
The Disposition filed indicates the action performed by the recipient
of Internet FAX Full Mode. This filed must be present. disposition-
modifier$B!J(J G3Fax-report-request$B!K(J will be used for confirmation.

The syntax for the Disposition filed is:

        Disposition: automatic-action/MDN-sent-Automatically
                ; processed / G3Fax-report-request




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4.3.5$B!!(Jextension-field

(1) confirmation
Additional MDN field is defined for confirmation.  confirmation of
recipient is expressed using result code, received page number and
error page number.

        G3Fax-Report: G3Fax-Results=code
                                ;G3Fax-Pages=received page number
                                ;G3Fax-Errorpage=error page number

(2)     capability response
Additional MDN field is defined for capability response.  Capabilities
of recipient is expressed using FCF and FIF in CCITT T30 frame
format[5].

        G3Fax-t30frame:G3Fax-frame= t30-fcf [ "," t30-fif ]

































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5.  Security considerations

The following security considerations apply when using Extended
MDNs for Internet FAX Full Mode:



5.1 Forgery

Extended MDNs may be forged as easily as ordinary Internet
electronic mail. User agents and Internet that wish
to make automatic use of MDNs should take appropriate precautions
to minimize the potential damage from denial-of-service attacks.

Security threats related to forged MDNs include the sending of:

(a)  A falsified disposition notification when the indicated dis-
     position of the message has not actually ocurred,

(b)  Unsolicited MDNs


5.2 Confidentiality

Another dimension of security is confidentiality.  There may be
cases in which a message recipient does not wish the disposition of
messages addressed to a recipient of Internet FAX Full mode to be
known or is concerned that the sending of MDNs may reveal other
confidential information (e.g.,when the message was read).
In this situation, it is acceptable for the recipient of Internet
FAX Full mode  to issue "denied" MDNs or to silently ignore requests
for MDNs.

Headers of the original message returned in part 3 of the
multipart/report could reveal confidential information about host
names and/or network topology inside a firewall.

An unencrypted MDN could reveal confidential information about an
encrypted message, especially if all or part of the original message
is returned in part 3 of the multipart/report.  Encrypted MDNs are
not defined in this specification.

In general, any optional MDN field may be omitted if the Reporting
recipient of Internet FAX Full mode determines that inclusion of
the field would impose too great a compromise of site
confidentiality.  The need for such confidentiality must be balanced
against the utility of the omitted information in MDNs.



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5.3 Non-Repudiation


Within the framework of today's Internet Mail, the Extended MDNs
defined in this document provide valuable information to the mail
user; however, MDNs can not be relied upon as a guarantee that a
message was or was not not seen by the recipient.  Even if MDNs are
not actively forged, they may be lost in transit.  The Extended MDN
issuing mechanism may be bypassed in some manner by the recipient of
Internet FAX Full mode.








































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6.   Collected Grammar

Additional grammar for MDN is described in IANA registration form.


6.1  IANA registration for Disposition-Notification-Options header
parameter names


6.1.1  G3Fax-capability-request

This is the parameter for Internet FAX capability request.

(a)     proposed parameter name

        G3Fax-capability-request

(b)  syntax

        Disposition-Notification-Options :
                "Disposition-Notification-Options" ":"
                "G3Fax-capability-request"$B!!(J"=" "required"

(c)parameter values

        G3Fax-capability-request is capability request of Internet
        FAX Full mode


6.1.2  G3Fax-report-request

This is the parameter for Internet FAX confirmation request.

(a)     proposed parameter name

        G3Fax-report-request

(b)  syntax

        Disposition-Notification-Options :
                "Disposition-Notification-Options" ":"
                "G3Fax-report-request"$B!!(J"=" "required"

(c)parameter values

        G3Fax-report-request is confirmation request of Internet
        FAX Full Mode.



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6.1.3  G3Fax-t30frame-parameter

This is the parameter for Recipient capabilities of Internet FAX Full
Mode.

(a)     proposed parameter name

        G3Fax-t30frame-parametert

(b)  syntax

        Disposition-Notification-Options :
                "Disposition-Notification-Options" ":"
                disposition-notification-parameters

        disposition-notification-parameters =
                parameter * ( ";" parameter )

        parameter = "G3Fax-t30frame-parameter"

        G3Fax-t30frame-parameter =
                "G3Fax-t30frame" "="  t30-fcf [ "," t30-fif ]

        t30-fcf = *text

        t30-fif = *text

(c)parameter values

        t30-fcf =*text is hexdecimal expression of FCF octet in T.30.
        Some FCFs are as follows;
        NSF     20
        CSI     40
        DIS     80
        NSS     23
        TSI     43
        DCS     83

        t30-fif =*text is Hexdecimal expression of FIF octets in T.30.
        The first octet of FIF is located in first character in text.
        LSB of  octet is the first bit of FIF.









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6.2  IANA registration for disposition modifier names

6.2.1 G3Fax-capability-request

(a)     disposition-modifier name

        G3Fax-capability-request

(b)semantics

        capability request of Internet FAX full Mode


6.2.2 G3Fax-report-request

(a)     disposition-modifier name

        G3Fax-report-request

(b)     semantics

        capability request of Internet FAX Full Mode



























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6.3     IANA registration for MDN extension field names


6.3.1$B!!(JG3Fax-t30frame

This is the field for Command data from sender in Internet FAX Full
Mode.

(a)     field name

        G3Fax-t30frame-field


(b)syntax

        field = "G3Fax-t30frame" ":" G3Fax-t30frame-field

        G3Fax-t30frame-field = parameter * ( ";" parameter )

        parameter = "G3Fax-t30frame-parameter"

        G3Fax-t30frame-parameter =
                "G3Fax-t30frame" "=" t30-fcf [ "," t30-fif ]

        t30-fcf = *text

        t30-fif = *text

(c)field value

        t30-fcf =*text is hexdecimal expression of FCF in T.30

        Some FCFs are as follows;
        NSF     20
        CSI     40
        DIS     80
        NSS     23
        TSI     43
        DCS     83

        t30-fif =*text is Hexdecimal expresion of FIF octets in T.30.
        The first octet of FIF is located in first character in text.
        LSB of  octet is the first bit of FIF.







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6.3.2  G3Fax-Report

This is the fieled foe confirmation of Internet FAX Full Mode

(a)     field name

        G3Fax-Report-field

(b)syntax

        field = "G3Fax-Report" ":" $B!!(Jresults
                                ; $B!!(Jpages
                                ; $B!!(Jerrorpage

        results = "G3Fax-Results" "=" code

        pages = "G3Fax-Pages" "=" numeric

        errorpage = "G3Fax-Errorpage" "=" numeric * ( "," numeric )




(c)field value

        results =code is as follows;
        "00"    Successful reception
        "01"    Unsuccessful reception
        "02"    Capabilities mismatch.  The receiving terminal cannot
                interpret the message data correctly
        "03"    does not support the format used in this message
        "04"    does not support relay feature

        pages =numeric is total page.

        errorpage =numeric is error page number














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7.  Example

7.1 Capability request

Date: Wed,20 Sep 1995 00:19:00 (EDT)-0400
From: Jane Sender <Jane_Sender@huge.com>
Message-Id: <199509200019.12345@huge.com>
Subject: Internet FAX Full Mode Capability Request
To: Tom Recipient <Tom_Recipient@mega.edu>
Disposition-Notification-To: Jane_Sender@huge.com
Disposition-Notification-Options: G3Fax-capability-request=required


7.2 Capability response

Date: Wed,20 Sep 1995 00:19:00 (EDT)-0400
From: Tom Recipient <Tom_Recipient@mega.edu>
Message-Id: <199509200020.12345@mega.edu>
Subject: Internet FAX Full Mode Capability Response
To: Jane Sender <Jane_Sender@huge.com>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=disposition-notification;
              boundary="RAA14128.773615766/mega.edu"

--RAA14128.773615766/mega.edu

The message sent on 1995 Sep 19 at 00:18:00 (EDT) -0400 to
Tom Recipient <Tom_Recipient@mega.edu> with subject " Internet FAX Full
Mode Capability Request " has been processsed in Internet FAX Full Mode.

--RAA14128.773615766/mega.edu
Content-Type: message/disposition-notification

Reporting-UA: Toms-pc.cs.mega.edu; IFAX-FullMode
Original-Recipient: rfc822;Tom-Recipient@mega.edu
Final-Recipient: rfc822;Tom-Recipient@mega.edu
Original-Message-ID: <199509200019.12345@huge.com>
Disposition: automatic-action/MDN-sent-automatically;
        processed / G3Fax-capability-request
G3Fax-t30frame:G3Fax-frame=40,3333333320323220313131;
        G3Fax-frame=20,000088;
        G3Fax-frame=80,00CF79

--RAA14128.773615766/mega.edu--






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7.3 Message and confirmation request

Date: Wed,20 Sep 1995 00:21:00 (EDT)-0400
From: Jane Sender < Jane_Sender@huge.com>
Message-Id: <199509200021.12345@huge.com>
Subject: Internet FAX Full Mode Image Transmission
To: Tom Recipient <Tom_Recipient@mega.edu>
MIME-Version: 1.0
Disposition-Notification-To:
Jane_Sender@huge.com
Disposition-Notification-Options:G3Fax-report-request=required;
                        G3Fax-frame=43,3737373720383820393939;
                        G3Fax-frame=23,000088;
                        G3Fax-frame=83,00C679
Content-Type: multipart/ mixed;
              boundary="RAA14128.773615768/ huge.com"

--RAA14128.773615768/huge.com
    Content-type: text/plain; charset=us-ascii

 [original text message goes here]

--RAA14128.773615768huge.com
Content-type: image/ tiff; application=faxbw
Content-Transfer-Encoding: base64

[original TIFF-FX message goes here]

--RAA14128.773615768/ huge.com--





















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7.4 Confirmation

Date: Wed,20 Sep 1995 00:22:00 (EDT)-0400
From: Tom Recipient <Tom_Recipient@mega.edu>
Message-Id: <199509200022.12345@mega.edu>
Subject: Internet FAX Full Mode Disposition notification
To: Jane Sender <Jane_Sender@huge.com>
MIME-Version: 1.0
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              boundary="RAA14128.773615769/mega.edu"

--RAA14128.773615769/mega.edu

The message sent on 1995 Sep 19 at 00:21:00 (EDT) -0400 to Tom Recipient
 <Tom_Recipient@mega.edu> with subject " Internet FAX Full Mode Image
Transmission" has been processed in Internet FAX Full Mode.  This is no
guarantee that the message has been read or understood.

--RAA14128.773615769/mega.edu
Content-Type: message/disposition-notification

Reporting-UA: Toms-pc.cs.mega.edu; IFAX-FullMode
Original-Recipient: rfc822;Tom-Recipient@mega.edu
Final-Recipient: rfc822;Tom-Recipient@mega.edu
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--RAA14128.773615769/mega.edu--













Maeda                      Expiers September 1998                Page 23

Extended MDN for IFAX Full Mode                            10 March 1998
Internet Draft


8.      Acknowledgements

Active for this document were: Yoshio Yosiura, Motoaki Yoshino,
Shinji Kume, Youichi Kudo.



9.      References
[1]  Postel, J., "Simple Mail Transfer Protocol", STD 10, RFC 821,
        August 1982.

[2]  Crocker, D., "Standard for the Format of ARPA Internet Text
        Messages", STD 11, RFC 822, August l982.

[3]  Fajman, R. "An Extensible Message Format for Message Disposition
        Notification", RFC XXXX, November 1997.

[4]  Bradner, S., "Key words for use in RFCs to Indicate Requirement
        Levels", RFC 2119, March 1997.

[5]  ITU-T (CCITT), "Procedures for Document Facsimile Transmission in
        the General Switched Telephone Network ", ITU-T (CCITT)
        Recommendation T.30.

[6]   Vaudreuil, G., "The Multipart/Report Content Type for the
        Reporting of Mail System Administrative Messages", RFC 1892,
        Octel Network Services, January 1996.

[7]  ITU-T, "Internet Facsimile: Guidelines for the Support of the
        Comminication of Facsimile Documents", ITU-T Recommendation
        F.Ifax

[8]  ITU-T, "Procedures for the Transfer of Facsimile Data via Store
        and Forward on the Internet", ITU-T Recommendation
        T.Ifax1















Maeda                      Expiers September 1998                Page 24

Extended MDN for IFAX Full Mode                            10 March 1998
Internet Draft


10.  Copyright

Copyright (C) The Internet Society (1997, 1998).  All Rights
Reserved.

This document and translations of it may be copied and furnished  to
others, and derivative works that comment on or otherwise  explain it
or assist in its implementation may be prepared, copied,  published and
distributed, in whole or in part, without  restriction of any kind,
provided that the above copyright notice  and this paragraph are
included on all such copies and derivative  works.  However, this
document itself may not be modified in any  way, such as by removing
the copyright notice or references to the  InternetSociety or other
Internet organizations, except as needed for the purpose of developing
Internet standards in which case the  procedures for copyrights defined
in the Internet Standards  process must be followed, or as required to
translate it into languages other than English.

The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.

This document and the information contained herein isprovided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALLWARRANTIES, EXPRESS OR  IMPLIED, INCLUDING
BUT NOT LIMITED TOANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN
WILL NOTINFRINGE ANY RIGHTS OR ANY IMPLIED

WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.


11.  Auther's Address

Toru MAEDA
CANON Inc
3-30-2,Shimomaruko, Ohtaku,
Tokyo, Japan

Email:  maeda@ffm.canon.co.jp
Voice:  +81 3 3757 9738
Fax:    +81 3 3757 8205










Maeda                      Expiers September 1998                Page 25