1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU X.421 (06/1999) SERIES X: DATA NETWORKS AND OPEN SYSTEM COM M U N I CAT I ON S Message Handling Systems Message Handling Systems: COMFAX use of MHS ITU-T Recommendation X.421 (Previously CCITT Recommendation)
2、 ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS Il PUBLIC DATA NETWORKS (I Services and facilities Interfaces Transmission, signalling and switching Network aspects Maintenance Administrative arrangements OPEN SYSTEMS INTERCONNECTION Model and notation Service defimition
3、s Connection-mode protocol specifications Connectionless-mode protocol specifications PICS proformas Protocol Identification Security Protocols Layer Managed Objects Conformance testing INTERWORKING BETWEEN NETWORKS General Satellite data transmission systems ING SYSTEMS DIRECTORY OS1 NETWORKING AND
4、 SYSTEM ASPECTS Networking Efficiency Quality of service Naming, Addressing and Registration Abstract Syntax Notation One (ASN. 1) OS1 MANAGEMENT Systems Management framework and architecture Management Communication Service and Protocol Structure of Management Information Management functions and O
5、DMA functions SECURITY OSI APPLICATIONS Commitment, Concurrency and Recovery Transaction processing Remote operations OPEN DISTRIBUTED PROCESSING X.l-X.19 X.20-X.49 X.50-X.89 X.90-X. 149 X. 150-X.179 X. 1 80-X.199 X.200-X.209 X.210-X.219 X.220-X.229 X.230-X.239 X.240-X.259 X.260-X.269 X.270-X.279 X.
6、280-X.289 X.290-X.299 X.300-X.349 x.350-x.399 X.400-X.499 X.500-X.599 X.600-X.629 X. 63 0-X .63 9 X.640-X.649 X.650-X.679 X.680-X.699 X.700-X.709 X.7 10-X.719 X.720-X.729 x.730-x.799 X.800-X.849 X.850-X.859 X.860-X.879 X.880-X.899 X.900-X.999 For further details, please refer to ITU-T List of Recomm
7、endations ITU-T RECOMMENDATION X.421 MESSAGE HANDLING SYSTEMS: COMFAX USE OF MHS Summary This revision of Recommendation X.42 1 is a consolidation of Recommendation X.421 (07/94) and Recommen- dation X.421/Amd. 1 (12/97). Recommendation X.42 1 defines the usage of the X.400 protocols, mainly the Int
8、erpersonal Messaging protocol (P2) and the Message Transfer protocol (Pi), to provide a global COMFAX service. The COMFAX service, as defined in Recommendations F. 162 (1996) and F. 163 (1 996), specifies a store and forward facsimile service where MHS may be used to provide a means of moving facsim
9、ile messages in COMFAX services. Recommendations F.162 and F.163 describe the COMFAX service using Facsimile store and Forward units (Fax SFUs) and its interconnection requirements. This Recommendation describes an X.400-based protocol for interconnecting Fax SFUs. Source Following ITU-T decision to
10、 publish new editions of the set of Message Handling Recommendations, this edition of ITU-T Recommendations X.42 1, dated 18 June 1999, consolidates X.42 1 (07/94) and X.42 1 Amendment 1 (1 2/97). FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the fi
11、eld of telecommuni- cations. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide ba
12、sis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the pr
13、ocedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-T?s purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression ?Administration? is used for conciseness to indicate both
14、 a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS e ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the a claimed Intellectual Property Right. The ITU takes no position concerning the evid
15、ence, validity or applicability med Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by , which may be required to implement this R
16、ecommendation. However, implementors are cautioned that this may resent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 2001 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mec
17、hanical, including photocopying and microfilm, without permission in writing fiom the ITU. CONTENTS 1 Scope 2 References 3 Definitions . 3.1 Terms defined in this Recommendation . 3.2 Terms defined in ITU-T Recommendation X.402 (1999) 3.3 Terms defined in ITU-T Recommendation X.411 (1999) . 3.4 Term
18、s defined in ITU-T Recommendation X.420 (1999) 4 Abbreviations 5 Functional Model . 6 Use ofX.400 Protocols 6.1 Actions by Fax SFU . 6.2 Addressing and routing . COMFAX service cover page COMFAX L1N and L2N notifications . Codes for COMFAX L1N and L2N notifications 6.3 6.4 6.5 Page 1 1 1 1 2 2 2 2 2
19、 3 3 3 8 9 10 List of Tables Table 1 iX.42 1 . IJse of X.400 protocols to nrovide COMFAX service . Table 21X.42 1 - Information in COMFAX service cover page Table 31X.421 - Matching between LlX and delivery-report . Table 41X.42 1 - Matching between L2N and ipn . Table 51X.421 - Codes for LIN Table
20、6iX.421 - Codes for L2N 4 8 9 10 11 11 List of Figures Figure 1K.421 . Functional model for COMFAX service . 3 Recommendation X.421 MESSAGE HANDLING SYSTEMS: COMFAX USE OF MHS 1 Scope This Recommendation defines a functional model and operational procedures to interconnect Fax SFUs using MHS protoco
21、ls. To provide seamless interaction, this Recommendation details the specific elements of P1 and P2 protocols defined in the X.400-series Recommendations to be used for the store and forward exchange of facsimile messages between SFUs. Interworking between the COMFAX service and other MHS services i
22、s for further study. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time .of publication, the editions indicated were valid. All Recommendations and other references
23、are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. - ITU-T Recommen
24、dation F. 162 (1996), Service and operational requirements of store-and-fonvard facsimile service (COMFAX). ITU-T Recommendation F. 163 (1996), Operational requirements of the interconnection of facsimile store-and- forward units. ITU-T Recommendation F.400fX.400 (1999), Message handling system and
25、service overview ISO/IEC 1002 1-1 : 1999, Information technology - Text Communication - Message Handling Systems (MHS) - Part I: System and Service Overview. CCITT Recommendation F.410 (1992), The public message transfer service. ITU-T Recommendation X.402 (1999) I ISO/IEC 1002 1-2: 1999, Informatio
26、n technology - Message Handling Systems (MHS): Overall architecture. ITU-T Recommendation X.411 (1999) I ISO/IEC 10021-4:1999, Information technology - Message Handling Systems (MHS): Message transfer system: Abstract service definition and procedures. Systems (MHS): Interpersonal messaging system.
27、- - , ,ITU-T Recommendation X.420 (1999) I ISOhEC 10021-7: 1999, Information technology - Message Handling Definitions Terms defined in this Recommendation ecommendation defines the following terms: 3.1J Originating Fax SFU of this message. originating Fax SFU: The Fax SFU which has accepted a messa
28、ge from a user of COMFAX is defined as the 3.1.2 as the Destination Fax SFU of this message. destination Fax SFU: The Fax SFU which has the responsibility to deliver a message to a recipient is defined 3.1.3 defined as the Originating COMFAX-AU of this message. originating COMFAX-AU: The COMFAX-AU w
29、hich has accepted a message from a user of COMFAX is 3.1.4 recipient is defined as the Destination COMFAX-AU of this message. destination COMFAX-AU: The COMFAX-AU which has the responsibility to deliver a message to a 3.1.5 transfer System: A MHS store and forward message transfer system which can t
30、ransfer messages between SFUS or between COMFAX and other MHS services is called a transfer system. Details of interconnection requirements between COMFAX and other MHS services and the associated protocols are for further study. 3.2 Terms defined in ITU-T Recommendation X.402 This Recommendation us
31、es terms defined in ITU-T Recommendation X.402. a) Access Unit (AU); b) Message Transfer Agent (MTA); c) Message Transfer System (MTS); d) MHS-users; e) MTS-users. 3.3 Terms defined in ITU-T Recommendation X.411 This Recommendation uses terms defined in ITU-T Recommendation X.411: - Message transfer
32、 protocol (Pi). 3.4 Terms defined in ITU-T Recommendation X.420 This Recommendation uses terms defined in ITU-T Recommendation X.420: - Interpersonal messaging protocol (P2 or IPM). 4 Abbreviations This Recommendation uses the following abbreviations together with those listed in Recommendation X.40
33、2: COMFAX COMFAX-AU COMFAX access unit COMFAX-user Service and operational requirements of store and forward facsimile service A direction of the COMFAX service Fax SFU Facsimile store and forward unit. 5 Functional Model This clause provides a functional model of COMFAX based on Recommendation X.40
34、2. Figure 1 describes this model. COMFAX service is provided by objects such as SFU and users. The Fax SFU engages the services of MHS through transfer-ports that are associated with each message transfer agent (MTA). One or more MTAs compose the MHS message transfer system. An MTA may be associated
35、 with zero or more access units. Once the facsimile message enters the MTS, it is encapsulated in MHS P2 and P1 protocols. In MHS the P2 protocol is used between MHS-users and the P1 protocol is used between MTS users. In Figure 1, Functional Model for COMFAX service, the COMFAX-AU is the MTS-user i
36、n its interaction with the MTA and it also represents the MHS-user on behalf of the COMFAX-user. In this figure, the COMFAX-user is represented by the term user. User COMFAX-AU Transfer-port Figure 1K.421- Functional model for COMFAX service 6 Use of X.400 Protocols 6.1 Actions by Fax SFU Table 1 de
37、scribes actions to be taken by Fax SFUs to provide interconnection. Table 1 also describes actions to be taken by a MTS when it is used to transfer messages between Fax SFUs. Use of X.400 protocol elements which are not defined in this Recommendation are for further study. 6.2 Addressing and routing
38、 Originators and recipients of messages shall be identified by OR-names as defined in Recommendation X.402. Telephone numbers of G3 facsimile terminals connected to public telephone network shall be identified by network-address. It is recommended that country-name, administration-domain-name are sp
39、ecified when the network-address is used. Use of other types of name to identify telephone numbers for originators and recipients is a local matter. NOTE-It is not allowed in Recommendation X.411 (1984 or 1988) to combine network-address with other types of name elements suchs personal-name for one
40、recipient. This feature can be provided either by bifaterul agreement or by using Recom- mendation X.4 1 1 (1 992 or later). Routing of messages between Fax SFUs and/or Transfer Systems shall be performed according to Recom- mendation X.4 1 1. Routing of messages inside a Fax SFU is a local matter.
41、Table 1K.421 - Use of X.400 protocols to provide COMFAX service Reference 6. IR. I63 COMFAX Element of service Single address message Actions to be taken by Fax SFU andor Transfer System Each COMFAX subscriber identified by an access management procedure has a unique OR address. This OR address is e
42、ncoded in the Originator-name element and the originator element of a message in the Originating Fax SFU. A value used in the originator-name element and the originator element shall be the same. A recipient address of a single address message is encoded in the recipient-name element and the primary
43、-recipients element of a message in the Originating Fax SFU. The primary-recipients element is used to display the Recipient Information in a cover page in the destination Fax SFU. A name value used in the recipient-name element and the primary-recipients element shall be the same. A PI positive and
44、 negative delivery-reports may be requested on a per message basis. On origination, it conveys the Originating Fax SFUs desire to receive a transfer system report for the named recipient indicating that the message has left the transfer system and is now in the possession of the Destination Fax SFU,
45、 see 6.7 and 6.8F.163. Content-type is set to 2 according to X.420 (Note 1). Trace-information element is used according to x.411. G3 Image data of a message is encoded into g3-facsimile (body part) element (Note 2). Related protocol elements P1: originator-name recipient-name content-type trace-inf
46、ormation per-recipient-indicators: originating-MTA-report originating-MTA-non- delivery-report P2: originator primary-recipients g3-facsimile ORG M M M M M O M M M M DST M M M M M M M M M M Table 1/X.421 - Use of X.400 protocols to provide COMFAX service (continued) 3 Reference 6.1F.163 : 6.2R.163 6
47、.3F.163 COMFAX Element of service Multiple address message Address list codes Message identification Actions to be taken by Fax SFU andlor Transfer System Each customer identified by an access management procedure has a unique OR address. This name is encoded in the originator-name element and the o
48、riginator element of a message in the Originating Fax SFU. A name used in the originator-name element and the originator element shall be the same. Recipient addresses of a multiple address message are encoded in the recipient-name element and the primary-recipients element of a message in the Origi
49、nating Fax SFU. The primary-recipients element is used to display the Recipient Information in a cover page in the Destination Fax SFU. A name value used in the recipient-name element and the primary-recipients element shall be the same. A P 1 positive and negative delivery-report may be requested on a per message basis. On origination, it conveys the Originating Fax SFUs desire to receive a transfer system report for each recipient indicating that the message has left the transfer system and is now in the possession of the Destination Fax SFU, see 6.7 and 6.8R.163. Content-type is s
