Rec. ITU-T X.420 (09/1992) MESSAGE HANDLING SYSTEMS INTERPERSONAL MESSAGING SYSTEM
FOREWORD
INTRODUCTION
SECTION 1 INTRODUCTION
1 Scope
2 Normative references
    2.1 Open Systems Interconnection
    2.2 Message Handling Systems
    2.3 Directory Systems
    2.4 Language Code
    2.5 Character Sets
    2.6 Telematic Services
    2.7 File Transfer
    2.8 Open Document Architecture
3 Definitions
4 Abbreviations
5 Conventions
    5.1 ASN.1
    5.2 Grade
    5.3 Terms
SECTION 2 ABSTRACT INFORMATION OBJECTS
6 Overview
7 Interpersonal messages
    7.1 Heading field component types
    7.2 Heading fields
    7.3 Body part types
8 Interpersonal notifications
    8.1 Common fields
    8.2 Non-receipt fields
    8.3 Receipt fields
    8.4 Other notification type fields
SECTION 3 ABSTRACT SERVICE DEFINITION
9 Overview
10 Primary Object types
    10.1 Interpersonal Messaging System user
    10.2 Interpersonal Messaging System
11 Primary Port types
    11.1 Origination
    11.2 Reception
    11.3 Management
12 Abstract operations
    12.1 Origination abstract operations
    12.2 Reception abstract operations
    12.3 Management abstract operations
13 Abstract errors
    13.1 Subscription Error
    13.2 Recipient Improperly Specified
14 Other capabilities
SECTION 4 ABSTRACT SERVICE PROVISION
15 Overview
16 Secondary Object types
    16.1 Interpersonal Messaging System user agent
    16.2 Interpersonal Messaging System message store
    16.3 Telematic agent
    16.4 Telex access unit
    16.5 Physical Delivery Access Unit
    16.6 Message Transfer System
17 Secondary Port types
    17.1 Submission
    17.2 Delivery
    17.3 Retrieval
    17.4 Administration
    17.5 Import
    17.6 Export
18 User agent operation
    18.1 State variables
    18.2 Performance of Origination operations
    18.3 Performance of Management operations
    18.4 Invocation of Reception operations
    18.5 Internal procedures
19 Message Store operation
    19.1 Creation of Information objects
    19.2 Maintenance of Attributes
    19.3 Notification of Non-receipt
    19.4 Auto-forwarding
    19.5 Manual Forwarding
20 Message Contents
    20.1 Content
    20.2 Content type
    20.3 Content length
    20.4 Encoded Information types
21 Port Realization
22 Conformance
    22.1 Origination Versus Reception
    22.2 Statement Requirements
    22.3 Static requirements
    22.4 Dynamic Requirements
ANNEX A Heading extensions
ANNEX B Extended body part types
ANNEX C Message store attributes
ANNEX D Reference definition of Object Identifiers
ANNEX E Reference definition of abstract information objects
ANNEX F Reference definition of functional objects
ANNEX G Reference definition of Abstract Service
ANNEX H Reference definition of heading extensions
ANNEX I Reference definition of extended body part types
ANNEX J Reference definition of message store attributes
ANNEX K Reference definition of upper bounds
ANNEX L Support of the Interpersonal Messaging Service
ANNEX M Differences between CCITT X.420 Recommendation and the corresponding ISO/IEC International Standard
ANNEX N Summary of changes to the 1984 version of Recommendation X.420
ANNEX O Summary of changes to the 1988 version of Recommendation X.420
ANNEX P Index
ANNEX Q Alphabetical list of abbreviations used in this Recommendation