OSI/MHS Gateway Programmatic Interface (GPI) Reference Manual

Introduction to the GPI

OSI/MHS Gateway Programmatic Interface (GPI) Reference Manual—522223-001

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Conformance of the GPI to X.400 API Specifications

The CCITT has ratified two series of standards for X.400 message handling, one in 1984

and the other in 1988. Two versions of the X.400 API have been specified, one for use

with the X.400 (1984) standard and one for use with both the X.400 (1984) and X.400

(1988) standards.

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The first version, the X.400 Gateway API, was specified by the X.400 APIA for use

with the X.400 (1984) standard. The X.400 Gateway API Specification, Version 4.0,

includes information architecture and functions.

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The second version was specified by the X.400 APIA and the X/Open Company

Limited. The OSI Object Management API Specification describes the functions and

the X.400 API Specification, Version 2.0, describes the information architecture.

The GPI conforms to the two versions of the specifications as follows:

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The object management and message transfer procedures closely conform to the

functionality specified in the first version.

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The information architecture closely conforms to the second version. In the object

class descriptions in Section 3, all 1988 extensions are noted.

For error checking and gateway control, the GPI provides proprietary procedures not

specified by the X.400 APIA.

For a list of specifications, see the preface, About This Manual