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Appendix The Applications Interface CAPI 2.0
As early as 1989, ISDN manufacturers began develop-
ment work on a standard interface for the rapidly expand-
ing ISDN market. The first version of CAPI concentrated
on the German national ISDN protocol 1TR6, as an
international standard for ISDN protocols was not yet
available. In 1990 development was complete, and a
CAPI Working Group was formed by ISDN application and
hardware manufacturers, large-scale ISDN users, user
groups and the German PTT, at that time DBP Telekom.
CAPI Version 1.1 was a milestone in the development of
the national ISDN market in Germany. Today all German
ISDN solutions and a large proportion of international
products are based on CAPI.
The international standardization of ISDN-protocol speci-
fications is now complete, and nearly all telecommunica-
tions network operators provide BRI and PRI lines on the
basis of the international standard Q.931/ETS 300 102.
With CAPI 2.0 a version based on this standard now is
available.The experience gained in Germany and other
countries over the past years in the development of an
ISDN applications programming interface, along with the
enormous base of installed CAPI solutions, have contrib-
uted greatly to the development of this new applications
interface for international ISDN systems.
Over ten years of experience in the growing ISDN market
have gone into CAPI 2.0. This version has all the
advantages of an open interface and covers most ISDN
features (including data communications, telephony,
Group 3 fax and video conferencing). Since CAPI handles
ISDN subscriber interface control functions, these no
longer have to be programmed. This simplifies the
development of ISDN applications. Furthermore, appli-
cations no longer have to be tailored to national or
manufacturer-specific systems, so that a greater variety
of applications is available.
By using CAPI Version 2.0, the international market
benefits from comprehensive technological know-how
with great profit potential.
CAPI 1.1
CAPI 2.0
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