1

Scope

This part of ISO 10021 specifies the MTS Access Protocol (P3) used between a remote user-agent and the MTS to provide access to the MTS Abstract Service defined in ISO/IEC 10021-4.

This part of ISO/IEC 10021 also specifies the MS Access Protocol (P7) used between a remote user-agent and a message-store (MS) to provide access to the MS Abstract Service defined in ISO/IEC 10021-5.

This part of ISO/IEC 10021 also specifies the MTS Transfer Protocol (P1) used between MTAs to provide the distributed operation of the MTS as defined in ISO/IEC 10021-4.

ISO/IEC 10021-2 identifies the other International Standards which define other aspects of Message Handling Systems.

Section two of this part of ISO/IEC 10021 specifies the MHS Access Pro tocols (P3 and P7). Clause 6 provides an overview of the MHS Access Protocols. Clause 7 defines the abstract-syntax of the MTS Access Protocol (P3). Clause 8 defines the abstract- syntax of the MS Access Protocol (P7). Clause 9 defines the mapping of the MHS Access Protocols onto used services. Clause 10 specifies conformance requirements for systems implementing the MHS Access Protocols.

Section three of this part of ISO/IEC 10021 specifies the MTS Transfer Protocol (P1). Clause 11 provides an overview of the MTS Transfer Protocol (P1). Clause 12 defines the abstract- syntax of the MTS Transfer Protocol (P1). Clause 13 defines the mapping of the MTS Transfer Protocol (P1) onto used services. Clause 14 specifies conformance requirements for systems implementing the MTS Transfer Protocol (P1).

Annex A provides a reference definition of the MHS protocol object identifiers cited in the ASN.1 modules in the body of this part of ISO/IEC 10021.

Annex B describes protocol rules for interworking with implementations of the CCITT Recommendation X.411 (1984) using the MTS Transfer Protocol (P1).

Annex C identifies the differences between the CCITT Recommendation X.411 (1984) and this part of ISO/IEC 10021.

Annex D identifies the technical differences between the ISO/IEC and CCITT versions of CCITT Recommendations X.419 and ISO/IEC 10021-6.

Annex E provides an index to this part of ISO/IEC 10021, categorized into: Abbreviations; Terms; Information Items; ASN.1 modules; ASN.1 macros; ASN.1 types; and ASN.1 values.