The origins of the CAPI-Association go back to the year ´89,
when the three German ISDN-card-manufacturers AVM, Stollman
and Systec established the "CAPI-Arbeitskreis".
This working-group arouse from the need of a vendor-independent
programming-interface for personal-computer based isdn-solutions.
Soon many other manufacturers of isdn-hardware, developers
of isdn-applications and even the predecessor of the "Deutsche
Telekom AG", the "Deutsche Bundespost Telekom"
joined in. This working group established an application programming
interface for ISDN called CAPI (COMMON-ISDN-API).
This interface has had an incredible success. Almost every
single ISDN-application for personal-computers developed in
Germany is based on CAPI. An increasing number of developments
in other European countries are now also CAPI-based. The CAPI-working-group
continued its work defining extensions to the original specification.
The extension include support of different operation-systems
(DOS, Windows, OS/2, Netware, Unix), fax-capabilites, direct-dialing-in,
dtmf-detection... When the European d-channel- protocol DSS-1
was introduced, the working-group defined an extension for
CAPI 1.1 to support this protocol-stack without requiring
changes in any existing application.
Soon the need for an updated version of CAPI became visible.
The new interface specification was designed to meet all necessary
points of Q.931 or ETS300102 compliant ISDN-protocol-stacks.
The new specification was named COMMON-ISDN-API
V2.0 (CAPI 2.0). At about this time the working-group, which
was to this point just an informal assembly of companies and
organisations wishing to participate, decided to "legalize"
its status to become an association ("eingetragener Verein
/ e.V" corresponds roughly to the term association under