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Common ISDN Application Programming Interface
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networking (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.