Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Common ISDN Application Programming Interface (short CAPI) is an ISDN-conform standardized software interface. With the help of the CAPI-Interface computer software intended for the use with ISDN can be provided, without knowledge of the deployed, proprietary ISDN card. CAPI was designed from 1989 by German manufacturers (AVM, Systec, Stollmann). Since 1991 CAPI is being developed further by CAPI Association e.V.. Implementations exist for different operating systems like Linux and Microsoft Windows. Through the ETSI CAPI 2.0 was introduced as standard ETS 300 324 (Profile B).

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