1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T X.420TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/1999) SERIES X: DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS Message Handling Systems Information technology Message Handling Systems (MHS) Interpersonal Messaging System ITU-T Recommendation X.420
2、ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS PUBLIC DATA NETWORKS Services and facilities X.1X.19 Interfaces X.20X.49 Transmission, signalling and switching X.50X.89 Network aspects X.90X.149 Maintenance X.150X.179 Administrative arrangements X.180X.199 OPEN SYSTEMS IN
3、TERCONNECTION Model and notation X.200X.209 Service definitions X.210X.219 Connection-mode protocol specifications X.220X.229 Connectionless-mode protocol specifications X.230X.239 PICS proformas X.240X.259 Protocol Identification X.260X.269 Security Protocols X.270X.279 Layer Managed Objects X.280X
4、.289 Conformance testing X.290X.299 INTERWORKING BETWEEN NETWORKS General X.300X.349 Satellite data transmission systems X.350X.369 IP-based networks X.370X.399 MESSAGE HANDLING SYSTEMS X.400X.499 DIRECTORY X.500X.599 OSI NETWORKING AND SYSTEM ASPECTS Networking X.600X.629 Efficiency X.630X.639 Qual
5、ity of service X.640X.649 Naming, Addressing and Registration X.650X.679 Abstract Syntax Notation One (ASN.1) X.680X.699 OSI MANAGEMENT Systems Management framework and architecture X.700X.709 Management Communication Service and Protocol X.710X.719 Structure of Management Information X.720X.729 Man
6、agement functions and ODMA functions X.730X.799 SECURITY X.800X.849 OSI APPLICATIONS Commitment, Concurrency and Recovery X.850X.859 Transaction processing X.860X.879 Remote operations X.880X.899 OPEN DISTRIBUTED PROCESSING X.900X.999 For further details, please refer to the list of ITU-T Recommenda
7、tions. ITU-T Rec. X.420 (06/1999) i INTERNATIONAL STANDARD ISO/IEC 10021-7 ITU-T RECOMMENDATION X.420 Information technology Message Handling Systems (MHS) Interpersonal Messaging System Summary This Recommendation | International Standard makes use of the enhanced message store defined in ITU-T Rec
8、. X.413 | ISO/IEC 10021-5. It also includes body part definitions for voice, reports and notifications. The ASN.1 is aligned with new ITU-T Rec. X.680 | ISO/IEC 8824-1 and ITU-T Rec. X.880 | ISO/IEC 13712-1, while retaining complete compatibility with the 1988 and 1992 IPM protocols. Numerous defect
9、 corrections are incorporated. This revision includes definitions for an extended set of ASN.1 integer values for IPM security error diagnostic codes. Source The ITU-T Recommendation X.420 was approved on 18th of June 1999. The identical text is also published as ISO/IEC International Standard 10021
10、-7. Following ITU-T decision to publish new editions of the set of Message Handling Recommendations, this edition of ITU-T Rec. X.420 consolidates Rec. X.420 (10/1996), X.420 Amendment 1 (08/1997), X.420 Technical Corrigendum 1 (08/1997), X.420 Amendment 2 (12/1997), X.420 Amendment 3 (09/1998), X.4
11、20 Technical Corrigendum 2 (12/1997) and X.420 Technical Corrigendum 3 (09/1998), ii ITU-T Rec. X.420 (06/1999) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-
12、T) is a permanent organ of ITU. 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 basis. The World Telecommunication Standardization Conference (WTSC), which meets every four
13、years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSC Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the n
14、ecessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to t
15、he possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside
16、of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest
17、 information and are therefore strongly urged to consult the TSB patent database. ITU 2003 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. X.420 (06/1999) iii CONTENTS Page SECTION 1 INTRODUCTION 1 1
18、 Scope 1 2 Normative references . 1 2.1 Open Systems Interconnection 1 2.2 Message Handling Systems. 2 2.3 Directory Systems . 2 2.4 Language Code . 2 2.5 Character Sets . 2 2.6 Telematic Services 2 2.7 File Transfer 3 2.8 Open Document Architecture 3 2.9 Digital Encoding of Sound 3 2.10 Cryptograph
19、y 3 3 Definitions 3 4 Abbreviations . 3 5 Conventions 3 5.1 ASN.1 4 5.2 Grade. 4 5.3 Terms 5 5.4 Conventions for attribute-types used in Table 5 5 5.5 Interpretation of UTC Time values . 5 SECTION 2 ABSTRACT INFORMATION OBJECTS . 5 6 Overview 5 7 Interpersonal Messages 6 7.1 Heading Field Component
20、Types 6 7.1.1 IPM Identifier 7 7.1.2 Recipient Specifier 7 7.1.3 OR-Descriptor. 8 7.1.4 IPMS Extension 8 7.2 Heading Fields 9 7.2.1 This IPM . 9 7.2.2 Originator 9 7.2.3 Authorizing Users . 9 7.2.4 Primary Recipients 9 7.2.5 Copy Recipients 9 7.2.6 Blind Copy Recipients 10 7.2.7 Replied-to IPM 10 7.
21、2.8 Obsoleted IPMs. 10 7.2.9 Related IPMs. 10 7.2.10 Subject 11 7.2.11 Expiry Time 11 7.2.12 Reply Time 11 7.2.13 Reply Recipients . 11 7.2.14 Importance 11 7.2.15 Sensitivity . 11 7.2.16 Auto-forwarded. 12 7.2.17 Extensions. 12 7.3 Body Parts. 12 7.3.1 Extended Body Part 13 7.3.2 Body Part Encoding
22、 14 7.4 Standard Body Part Types. 15 7.4.1 IA5 Text 15 7.4.2 G3 Facsimile . 15 7.4.3 G4 Class 1 . 16 7.4.4 Teletex. 16 iv ITU-T Rec. X.420 (06/1999) Page 7.4.5 Videotex 17 7.4.6 Encrypted 17 7.4.7 Message. 18 7.4.8 Mixed-mode 18 7.4.9 Bilaterally Defined 19 7.4.10 Nationally Defined 19 7.4.11 Genera
23、l Text 19 7.4.12 File Transfer 20 7.4.13 Voice 25 7.4.14 Report 27 7.4.15 Notification . 27 7.4.16 Forwarded Content 27 7.4.17 PKCS7 28 8 Interpersonal Notifications . 29 8.1 Common Fields . 30 8.1.1 Subject IPM 30 8.1.2 IPN Originator. 30 8.1.3 IPM Intended Recipient 30 8.1.4 Conversion EITs . 31 8
24、.1.5 Notification Extensions. 31 8.2 Non-receipt Fields. 31 8.2.1 Non-receipt Reason. 31 8.2.2 Discard Reason . 31 8.2.3 Auto-forward Comment 32 8.2.4 Returned IPM 32 8.2.5 NRN Extensions 32 8.3 Receipt Fields 32 8.3.1 Receipt Time. 33 8.3.2 Acknowledgment Mode 33 8.3.3 Suppl Receipt Info 33 8.3.4 R
25、N Extensions. 33 8.4 Other Notification Type Fields . 33 8.4.1 Absence Advice 33 8.4.2 Change of Address Advice 34 SECTION 3 ABSTRACT SERVICE DEFINITION. 35 9 Overview 35 10 Primary Object Types . 35 10.1 Interpersonal Messaging System User 35 10.2 Interpersonal Messaging System. 36 11 Primary Port
26、Types. 36 11.1 Origination 36 11.2 Reception 36 11.3 Management 36 12 Abstract Operations 36 12.1 Origination Abstract Operations . 37 12.1.1 Originate Probe . 37 12.1.2 Originate IPM . 37 12.1.3 Originate RN. 38 12.1.4 Originate ON. 38 12.2 Reception Abstract Operations 39 12.2.1 Receive Report 39
27、12.2.2 Receive IPM 39 12.2.3 Receive RN . 40 12.2.4 Receive NRN 40 12.2.5 Receive ON. 40 12.3 Management Abstract Operations. 40 12.3.1 Change Auto-discard. 40 12.3.2 Change Auto-acknowledgment. 41 12.3.3 Change Auto-forwarding 41 ITU-T Rec. X.420 (06/1999) v Page 13 Abstract Errors . 42 13.1 Subscr
28、iption Error . 42 13.2 Recipient Improperly Specified. 42 14 Other Capabilities. 42 SECTION 4 ABSTRACT SERVICE PROVISION 43 15 Overview 43 16 Secondary Object Types. 43 16.1 Interpersonal Messaging System User Agent 43 16.2 Interpersonal Messaging System Message Store 43 16.3 Telematic Agent 43 16.4
29、 Telex Access Unit . 44 16.5 Physical Delivery Access Unit 44 16.6 Message Transfer System 45 17 Secondary Port Types. 45 17.1 Submission 45 17.2 Delivery 45 17.3 Retrieval 45 17.4 Administration 45 17.5 Import 45 17.6 Export 45 18 User Agent Operation. 46 18.1 State Variables 46 18.2 Performance of
30、 Origination Operations 46 18.2.1 Originate Probe . 46 18.2.2 Originate IPM . 47 18.2.3 Originate RN. 47 18.2.4 Originate ON. 48 18.3 Performance of Management Operations 48 18.3.1 Change Auto-discard. 48 18.3.2 Change Auto-acknowledgment. 49 18.3.3 Change Auto-forwarding 49 18.4 Invocation of Recep
31、tion Operations 49 18.4.1 Receive Report 49 18.4.2 Receive IPM 49 18.4.3 Receive RN . 50 18.4.4 Receive NRN 50 18.4.5 Receive ON. 50 18.5 Internal Procedures 50 18.5.1 Auto-discard 50 18.5.2 Auto-acknowledgment 51 18.5.3 Auto-forwarding 52 19 Message Store Operation 53 19.1 Binding to the IPMS-MS. 5
32、3 19.1.1 MS-Bind-argument . 53 19.1.2 MS-Bind-result 53 19.2 Creation of Information Objects 53 19.2.1 Mapping an IPMS Message to an MS entry 54 19.2.2 Mapping of forwarding messages in the IPMS-MS 54 19.2.3 Presence of General-attributes in child-entries . 55 19.3 Maintenance of Attributes. 56 19.4
33、 Notification of Non-receipt . 57 19.5 IPMS-MS abstract-operation extensions. 57 19.5.1 MS-Bind extensions 57 19.5.2 MS-Bind-Result extensions 58 19.5.3 IPM -submission options. 58 19.5.4 IPM submission errors 60 vi ITU-T Rec. X.420 (06/1999) Page 19.5.5 Forwarding-request extension. 60 19.5.6 Delet
34、e extensions 60 19.6 IPMS-MS Attributes . 60 19.6.1 Summary Attributes 63 19.6.2 Heading Attributes 66 19.6.3 Body Attributes. 71 19.6.4 Notification Attributes 74 19.6.5 Correlation Attributes . 76 19.6.6 The IPMS-attribute-table information object class . 83 19.6.7 Generation of the IPMS-specific
35、Attributes 84 19.6.8 Attributes Subject to Modification 89 19.7 IPMS-MS matching rules 89 19.7.1 IPM-identifier-match. 89 19.7.2 IPM-location-match 89 19.7.3 OR-descriptor-match. 90 19.7.4 OR-descriptor-elements-match . 90 19.7.5 OR-descriptor-substring-elements-match . 90 19.7.6 OR-descriptor-singl
36、e-element-match 90 19.7.7 Recipient-specifier-match . 90 19.7.8 Recipient-specifier-elements-match 91 19.7.9 Recipient-specifier-substring-elements-match 91 19.7.10 Recipient-specifier-single-element-match. 91 19.7.11 Circulation-member-match . 91 19.7.12 Circulation-member-elements-match 91 19.7.13
37、 Circulation-member-substring-elements-match 91 19.7.14 Circulation-member-single-element-match. 92 19.7.15 Circulation-member-checkmark-match. 92 19.7.16 Distribution-code-match . 92 19.7.17 Information-category-match 92 19.8 IPMS-MS auto-actions 93 19.8.1 Auto-action performance 94 19.8.2 IPM Auto
38、-forward. 94 19.8.3 IPM Auto-acknowledgement 96 19.8.4 IPM Auto-correlate . 97 19.8.5 IPM Auto-discard 98 19.8.6 IPM auto-advise 98 19.9 Procedures for the IPMS-MS 100 19.9.1 Additional procedures for Message-delivery and Report-delivery . 100 19.9.2 Additional Procedures for MS-message-submission.
39、104 19.9.3 Additional Procedures for Fetch . 106 19.9.4 Additional Procedures for Delete and Auto-delete . 106 19.9.5 Auto-discard of expired IPMs. 106 20 Message Contents. 107 20.1 Content 107 20.2 Content Type. 107 20.3 Content Length 107 20.4 Encoded Information Types 108 21 Port Realization 108
40、22 Conformance 109 22.1 Origination Versus Reception . 109 22.2 Statement Requirements 109 22.3 Static Requirements 109 22.4 Dynamic Requirements. 110 Annex A General IPMS Extensions . 111 A.1 Heading Extensions. 111 A.1.1 Incomplete Copy. 111 A.1.2 Languages . 111 A.1.3 Auto-submitted 111 A.1.4 Bod
41、y Part Signature 111 ITU-T Rec. X.420 (06/1999) vii Page A.1.5 IPM Security Label . 112 A.1.6 Authorization Time . 113 A.1.7 Circulation List Recipients 113 A.1.8 Distribution Codes 114 A.1.9 Extended Subject. 115 A.1.10 Information Category 115 A.1.11 Manual Handling Instructions. 116 A.1.12 Origin
42、ators Reference. 116 A.1.13 Precedence Policy Identifier . 116 A.2 Recipient Extensions. 116 A.2.1 Circulation List Indicator 116 A.2.2 Precedence 117 A.3 Notification Extensions. 117 Annex B IPMS Security Extensions. 118 B.1 Recipient Security Request . 118 B.2 IPN Security Response 119 B.3 Securit
43、y Diagnostic Code 119 B.4 Additional UA Procedures 121 B.4.1 Originate IPM . 121 B.4.2 Originate IPN 122 B.5 Additional MS Procedures 124 B.6 MTS Extensions 124 B.6.1 Body Part Encryption Token. 124 B.6.2 Forwarded Content Token. 126 Annex C Reference Definition of Object Identifiers 127 Annex D Ref
44、erence Definition of Abstract Information Objects . 133 Annex E Reference Definition of Extended Body Part Types 143 E.1 Equivalents of Basic Body Part Types 143 E.2 General Text 144 E.3 File Transfer 145 E.4 Voice. 148 E.5 Report and Notification. 148 E.6 Forwarded Content 149 E.7 PKCS7. 150 Annex
45、F Reference Definition of Functional Objects. 151 Annex G Reference Definition of Abstract Service 152 Annex H Reference Definition of IPM Extensions 155 Annex I Reference Definition of Message Store Attributes . 159 Annex J Reference Definition of IPMS-MS auto-actions. 174 Annex K Reference Definit
46、ion of IPMS Security Extensions 178 Annex L Reference Definition of Upper Bounds . 181 Annex M Support of the Interpersonal Messaging Service 182 M.1 Support of Recipient Specifier Components . 182 M.2 Support of Heading Fields. 182 M.3 Support of Body Aspects. 183 M.4 Support of Notification Fields
47、. 184 M.5 Support of Envelope Fields. 184 M.6 Support of IPMS Message Store . 184 Annex N Security Model Supplement for IPMS 185 N.1 Introduction. 185 N.2 Security Services. 185 N.3 Supplements to Clause 10.2: Security Services 185 N.4 Body Part Encryption 185 N.5 Body Part Authentication and Integr
48、ity. 185 viii ITU-T Rec. X.420 (06/1999) Page N.6 IPM Security Labelling . 185 N.7 IPN Authentication 186 N.7.1 Proof of Notification . 186 N.7.2 Proof of Content 186 N.8 Non-repudiation of IPM Responsibility. . 186 N.8.1 Non-repudiation of Notification. 186 N.8.2 Non-repudiation of Content 186 Anne
49、x O ASN.1 Module for PKCS#7 187 Annex P Differences Between ISO/IEC 10021-7 and ITU-T Recommendation X.420. 192 Annex Q Summary of Changes to Previous Editions. 193 Q.1 Differences between CCITT Rec. X.420 (1984) and CCITT Rec. X.420 (1988) . 193 Q.2 Differences between CCITT Rec. X.420 (1988) and ISO/IEC 10021-7:1990 193 Q.3 Differences between ISO/IEC 10021-7:1990 and CCITT Rec. X.420 (1992) 193 Q.4 Differences between CCITT Rec. X.420 (1992)
