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
        2.9     Digital Encoding of Sound
 3     Definitions
 4     Abbreviations
 5     Conventions
        5.1     ASN.1
        5.2     Grade
        5.3     Terms
        5.4     Conventions for attribute-types used in Table 5
 6     Overview
 7     Interpersonal messages
        7.1     Heading field component types
                  7.1.1     IPM identifier
                  7.1.2     Recipient specifier
                  7.1.3     OR‑descriptor
                  7.1.4     IPMS extension
        7.2     Heading fields
                  7.2.1     This IPM
                  7.2.2     Originator
                  7.2.3     Authorizing Users
                  7.2.4     Primary Recipients
                  7.2.5     Copy Recipients
                  7.2.6     Blind Copy Recipients
                  7.2.7     Replied‑to IPM
                  7.2.8     Obsoleted IPMs
                  7.2.9     Related IPMs
                 7.2.10     Subject
                 7.2.11     Expiry Time
                 7.2.12     Reply Time
                 7.2.13     Reply Recipients
                 7.2.14     Importance
                 7.2.15     Sensitivity
                 7.2.16     Auto‑forwarded
                 7.2.17     Extensions
        7.3     Body Parts
                  7.3.1     Extended Body Part
                  7.3.2     Body Part Encoding
        7.4     Standard Body Part Types
                  7.4.1     IA5 Text
                  7.4.2     G3 Facsimile
                  7.4.3     G4 Class 1
                  7.4.4     Teletex
                  7.4.5     Videotex
                  7.4.6     Encrypted
                  7.4.7     Message
                  7.4.8     Mixed‑mode
                  7.4.9     Bilaterally Defined
                 7.4.10     Nationally Defined
                 7.4.11     General Text
                 7.4.12     File Transfer
                         Related Stored File parameter
                         Contents Type parameter
                         Environment parameter
                         Compression parameter
                         File Attributes parameter
                       Pathname attribute
                       Permitted actions attribute
                       Storage account attribute
                       Date and time attributes
                       Identity attributes
                       Availability attribute
                       Object size attributes
                       Access control attribute
                       Legal qualifications attribute
                      Private use attribute
                      Attribute extensions
                         Extensions parameter
                         File Transfer Body Part data
                         Encoded Information type
                 7.4.13     Voice
                 7.4.14     Report
                 7.4.15     Notification
                 7.4.16     Forwarded content
 8     Interpersonal notifications
        8.1     Common fields
                  8.1.1     Subject IPM
                  8.1.2     IPN Originator
                  8.1.3     IPM Intended Recipient
                  8.1.4     Conversion EITs
                  8.1.5     Notification Extensions
        8.2     Non‑receipt fields
                  8.2.1     Non‑receipt Reason
                  8.2.2     Discard Reason
                  8.2.3     Auto‑forward Comment
                  8.2.4     Returned IPM
                  8.2.5     NRN Extensions
        8.3     Receipt fields
                  8.3.1     Receipt Time
                  8.3.2     Acknowledgment Mode
                  8.3.3     Suppl Receipt Info
                  8.3.4     RN Extensions
        8.4     Other notification type fields
 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
                 12.1.1     Originate Probe
                 12.1.2     Originate IPM
                 12.1.3     Originate RN
                 12.1.4     Originate ON
       12.2     Reception abstract operations
                 12.2.1     Receive Report
                 12.2.2     Receive IPM
                 12.2.3     Receive RN
                 12.2.4     Receive NRN
                 12.2.5     Receive ON
       12.3     Management abstract operations
                 12.3.1     Change Auto‑discard
                 12.3.2     Change Auto‑acknowledgment
                 12.3.3     Change Auto‑forwarding
13     Abstract errors
       13.1     Subscription Error
       13.2     Recipient Improperly Specified
14     Other capabilities
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
                 18.2.1     Originate Probe
                 18.2.2     Originate IPM
                 18.2.3     Originate RN
                 18.2.4     Originate ON
       18.3     Performance of management operations
                 18.3.1     Change Auto-discard
                 18.3.2     Change Auto-acknowledgment
                 18.3.3     Change Auto-forwarding
       18.4     Invocation of reception operations
                 18.4.1     Receive Report
                 18.4.2     Receive IPM
                 18.4.3     Receive RN
                 18.4.4     Receive NRN
                 18.4.5     Receive ON
       18.5     Internal procedures
                 18.5.1     Auto-discard
                         Discard of IPM
                         Construction of NRN
                         Submission of NRN
                 18.5.2     Auto-acknowledgment
                         Construction of RN
                         Submission of RN
                 18.5.3     Auto-forwarding
                         Prevention of loops
                         Construction of IPM
                         Submission of IPM
                         Construction of NRN
                         Submission of NRN
19     Message Store operation
       19.1     Binding to the IPMS‑MS
                 19.1.1     MS-Bind-argument
                 19.1.2     MS-Bind-result
       19.2     Creation of information objects
                 19.2.1     Mapping an IPMS message to an MS entry
                 19.2.2     Mapping of forwarding messages in the IPMS‑MS
                 19.2.3     Presence of General-attributes in child-entries
       19.3     Maintenance of attributes
       19.4     Notification of Non-receipt
       19.5     IPMS‑MS abstract-operation extensions
                 19.5.1     MS-Bind extensions
                 19.5.2     MS-message-submission extensions
                         Forwarding-request extension
                         IPM submission options
                         IPM submission errors
                 19.5.3     Delete extensions
       19.6     IPMS‑MS attributes
                 19.6.1     Summary attributes
                         IPM Entry Type
                         IPM Synopsis
                         Body Parts Summary
                         IPM Auto-discarded
                 19.6.2     Heading attributes
                         Heading analyses
                         Heading fields
                         Heading sub-fields
                         Heading extensions
                 19.6.3     Body attributes
                         Extended Body Part Types
                         Extended Body Parts
                         Basic Body Parts
                         Basic Body Part Parameters components
                         Basic Body Part Data components
                 19.6.4     Notification attributes
                         Common fields
                         Non-receipt fields
                         Receipt fields
                         Other Notification Type Fields
                 19.6.5     Correlation attributes
                         Common attributes
                       AC Forwarding IPMs
                       AC Forwarded IPMs
                       AC Obsoleting IPMs
                       AC Obsoleted IPMs
                       AC Relating IPMs
                       AC Related IPMs
                       AC Replied-to IPM
                       AC Replying IPMs
                       AC Subject IPM
                         Submitted message correlation
                       AC IPM Recipients
                       AC Delivered Replies Summary
                       AC Correlated Delivered Replies
                       AC Delivered IPN Summary
                       AC Correlated Delivered IPNs
                         Delivered message correlation
                       AC Submitted Reply Status
                       AC Submitted IPN Status
                       AC Submitted IPNs
                       Recipient Category
                       Revised Reply Time
                 19.6.6     The IPMS-attribute-table information object class
                 19.6.7     Generation of the IPMS-specific attributes
                 19.6.8     Attributes subject to modification
       19.7     IPMS‑MS matching rules
                 19.7.1     IPM-identifier-match
                 19.7.2     IPM‑location‑match
                 19.7.3     OR-descriptor-match
                 19.7.4     OR-descriptor-elements-match
                 19.7.5     OR-descriptor-substring-elements-match
                 19.7.6     OR‑descriptor‑single‑element‑match
                 19.7.7     Recipient-specifier-match
                 19.7.8     Recipient-specifier-elements-match
                 19.7.9     Recipient-specifier-substring-elements-match
                19.7.10     Recipient‑specifier‑single‑element‑match
       19.8     IPMS‑MS auto-actions
                 19.8.1     Auto-action performance
                 19.8.2     IPM auto-forward
                 19.8.3     IPM auto-acknowledgement
                 19.8.4     IPM auto-correlate
                 19.8.5     IPM auto-discard
       19.9     Procedures for the IPMS‑MS
                 19.9.1     Additional procedures for Message-delivery and Report-delivery
                         Additional procedures for IPM auto-correlate
                         Additional procedures for IPM auto-forward
                         Additional procedures for IPM auto-discard
                 19.9.2     Additional procedures for MS-message-submission
                 19.9.3     Additional procedures for Fetch
                 19.9.4     Additional procedures for Delete and Auto-delete
                 19.9.5     Auto-discard of expired IPMs
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
        A.1     Incomplete Copy
        A.2     Languages
        A.3     Auto-submitted
Annex     B – IPMS security extensions
        B.1     Recipient Security Request
        B.2     IPN Security Response
        B.3     Security Diagnostic Code
        B.4     Additional UA procedures
                  B.4.1     Originate IPM
                  B.4.2     Originate IPN
                               B.4.2.1     Message Submission
                               B.4.2.2     IPN Security Response procedures
                             B.     Precedence of requests
                             B.     Content-non-repudiation requested
                             B.     Content-proof requested
                             B.     Ipn-non-repudiation requested
                             B.     Ipn-proof requested
        B.5     Additional MS procedures
Annex     C – Reference definition of Object Identifiers
Annex     D – Reference definition of abstract information objects
Annex     E – Reference definition of Extended Body Part Types
        E.1     Equivalents of Basic Body Part Types
        E.2     General Text
        E.3     File Transfer
        E.4     Voice
        E.5     Report and Notification
        E.6     Forwarded Content
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 Message Store attributes
Annex     J – Reference definition of IPMS‑MS auto-actions
Annex     K – Reference definition of IPMS security extensions
Annex     L – Reference definition of upper bounds
Annex     M – Support of the Interpersonal Messaging Service
        M.1     Support of recipient specifier components
        M.2     Support of heading fields
        M.3     Support of Body aspects
        M.4     Support of IPMS Message Store
Annex     N – Security model supplement for IPMS
        N.1     Introduction
        N.2     Security services
        N.3     Supplements to clause 10.2: Security services
        N.4     IPN Authentication
                  N.4.1     Proof of Notification
                  N.4.2     Proof of Content
        N.5     Non-repudiation of IPM Responsibility
                  N.5.1     Non-repudiation of Notification
                  N.5.2     Non-repudiation of Content
Annex     O – Differences between ISO/IEC 10021‑7 and ITU‑T Recommendation X.420
Annex     P – Summary of changes to previous editions
        P.1     Differences between CCITT Rec. X.420 (1984) and CCITT Rec. X.420 (1988)
        P.2     Differences between CCITT Rec. X.420 (1988) and ISO/IEC 10021‑7:1990
        P.3     Differences between ISO/IEC 10021‑7:1990 and CCITT Rec. X.420 (1992)
        P.4     Differences between CCITT Rec. X.420 (1992) and ITU‑T Rec. X.420 (1996) | ISO/IEC 10021‑7:1997
Annex     Q – Index