Source : Free On-Line Dictionary of Computing

Common ISDN Application Programming Interface
     
         (CAPI, Common-ISDN-API) A programming interface
        standard for an application program to communicate with an
        {ISDN} card.
     
        Work on CAPI began in 1989, focussing on the German ISDN
        protocol, and was finished in 1990 by a CAPI working group
        consisting of application providers, ISDN equipment
        manufacturers, large customers, user groups and DBP Telekom,
        resulting in COMMON-ISDN-API Version 1.1.  Following
        completion of the international protocol specification, almost
        every telecommunication provider offers {BRI} and {PRI} with
        {protocols} based on {Q.931} / ETS 3009 102.  Common-ISDN-API
        Version 2.0 was developed to support all Q.931 protocols.
     
        Latest version: 2.0, as of 1998-09-07.
     
        {Home (http://www.capi.org/)}.
     
        [Why not CIAPI?]
     
        (1998-09-07)