ITU T.180 : 1998

1 Scope
2 References
3 Definitions
4 Abbreviations
5 Structure of this Recommendation
6 Introduction to the XAPI
    6.1 Location of the XAPI
    6.2 Phases of communication
    6.3 Applications that are supported by XAPI
7 A Model of communication
    7.1 Classes of communication
    7.2 The state transition diagram as part of the model
8 Description of the XAPI
    8.1 XAPI in point-to-point and in multipoint
          environments
    8.2 XAPI functions and the corresponding state
          transition diagram
9 XAPI functions
    9.1 Conventions
    9.2 Communication-related functions
    9.3 Not communication-related functions
Annex A Interface definition language description
Annex B Error codes
Appendix I Examples of XAPI access to service providers
       I.1 XAPI access to the service provider for the
             ISDN-B-channel
       I.2 XAPI access to the service provided for BFT
             over T.30
       I.3 XAPI access to the service provider for
             FAX4 and BFT
       I.4 XAPI access to the service provider for
             ACSE and ROSE
       I.5 XAPI access to a Service Provider for Audio
             and Video (AV) Control
       I.6 CAPI access to the service provider for the
             T.120 conference control
       I.7 XAPI access to the service provider for T.127
             MBFT
Appendix II Tutorial: XAPI and selected providers
       II.1 XAPI and the ACSE/ROSE provider
       II.2 XAPU and the specific T.120 conference provider

Defines a homogenous access mechanism to communication services (known as XAPI). This is an abbreviation for eXtensive Application Programming Interface, which is an operating system and language-independent programming interface to general communication services. Defines functions permitting access by XAPI users to the services of an underlying provider and is applicable to all providers defined in the Recommendation. Introduces a communication model specifying the semantics of those XAPI functions which are communication-related.