CONTENTS

 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
                  7.1.1     Peer-to-peer communication
                  7.1.2     Multipeer 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
                  9.2.1     X-CONCONF/x_conconf
                  9.2.2     X-CONIND/x_conind
                  9.2.3     X-CONREQ/x_conreq
                  9.2.4     X-CONRSP/x_conrsp
                  9.2.5     X-RCVDATA/x_rcvdata
                  9.2.6     X-RCVDIS/x_rcvdis
                  9.2.7     X-RCVINFO/x_rcvinfo
                  9.2.8     X-RCVSP/x_rcvsp
                  9.2.9     X-RELCONF/x_relconf
                 9.2.10     X-RELIND/x_relind
                 9.2.11     X-RELREQ/x_relreq
                 9.2.12     X-RELRSP/x_relrsp
                 9.2.13     X-SNDDATA/x_snddata
                 9.2.14     X-SNDDIS/x_snddis
                 9.2.15     X-SNDINFO/x_sndinfo
                 9.2.16     X-SNDSP/x_sndsp
        9.3     Not communication-related functions
                  9.3.1     Functions for the initialization and de-initialization phase
                  9.3.2     Utility 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.1.1     Scope
                  I.1.2     References
                  I.1.3     Definitions
                  I.1.4     Abbreviations
                  I.1.5     Conventions
                  I.1.6     Introduction to the ISDN physical service provider access
                  I.1.7     Description of the access to the ISDN physical service provider
        I.2     XAPI access to the service provider for BFT over T.30
                  I.2.1     Scope
                  I.2.2     References
                  I.2.3     Definitions
                  I.2.4     Abbreviations
                  I.2.5     Conventions
                  I.2.6     Introduction to the BFT(T.30) provider access
                  I.2.7     Description of the access to the BFT(T.30) provider
        I.3     XAPI access to the service provider for FAX4 and BFT
                  I.3.1     Scope
                  I.3.2     References
                  I.3.3     Definitions
                  I.3.4     Abbreviations
                  I.3.5     Conventions
                  I.3.6     Introduction to the FAX4/BFT service provider access
                  I.3.7     Description of the access to the FAX4/BFT service provider
        I.4     XAPI access to the service provider for ACSE and ROSE
                  I.4.1     Scope
                  I.4.2     References
                  I.4.3     Definitions
                  I.4.4     Abbreviations
                  I.4.5     Conventions
                  I.4.6     Introduction to the ACSE/ROSE provider access
                  I.4.7     Description of the access to the ACSE/ROSE provider
        I.5     XAPI access to a Service Provider for Audio and Video (AV) Control
                  I.5.1     Scope
                  I.5.2     References
                  I.5.3     Definitions
                  I.5.4     Abbreviations
                  I.5.5     Conventions
                  I.5.6     Introduction to the video codec service provider access
                  I.5.7     Description of the access to the Video Codec Service Provider
        I.6     XAPI access to the service provider for the T.120 conference control
                  I.6.1     Scope
                  I.6.2     References
                  I.6.3     Definitions
                  I.6.4     Abbreviations
                  I.6.5     Conventions
                  I.6.6     Introduction to the conference control provider access
                  I.6.7     Description of the access to the conference control provider
        I.7     XAPI access to the service provider for T.127 MBFT
                  I.7.1     Scope
                  I.7.2     References
                  I.7.3     Definitions
                  I.7.4     Abbreviations
                  I.7.5     Conventions
                  I.7.6     Introduction to the MBFT service provider access
                  I.7.7     Description of the access to the MBFT service provider
Appendix II – Tutorial: XAPI and selected providers
       II.1     XAPI and the ACSE/ROSE provider
       II.2     XAPI and the specific T.120 conference provider
                 II.2.1     The T.120 system model
                 II.2.2     T.120 MBFT conferencing