Technical data

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CAPI
COMMON-ISDN-API (CAPI) provides a standardised interface to design software
applications that utilises ISDN Signing up to the CAPI-standard gives applications that
can communicate over ISDN without the need of considering manufacturer specific
implementations of ISDN.
At present, work with the standard has virtually stopped and most telephone opera-
tors provide ISDN based on Q931/ETSI 300 102, CAPI version 2.0 developed to sup-
port the protocol based on Q 931. CAPI has been developed to form the basis of
many different protocol stacks for networks, telephony and file transfer.
CAPI has currently been taken up as the European standard ETS 300 838 “Integrated
Service Digital Network (ISDN); Harmonized Programmable Communication
Interface (HPCI) for ISDN”.
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