Operation Manual

Features of CAPI
28 Controller C4 – 6 AVM System Architecture
pendence from specific manufacturers and thus a high level
of investment security; a wide variety of compatible applica-
tions for all kinds of operating systems and ISDN protocols,
etc. ISDN (the Integrated Services Digital Network) is beco-
ming attractive for more and more telecommunications users
since it affords fast and reliable transfer of information in
many different forms.
Over eleven 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 of the features of
ISDN. Since CAPI handles most ISDN subscriber interface
control functions, these no longer have to be programmed.
This simplifies the development of ISDN applications. Fur-
thermore, since applications no longer have to be tailored to
national or manufacturer-specific systems, a greater variety
of applications is available.
For further information about CAPI, please see the CAPI
Association’s Web site at
http://www.capi.org/
Features of CAPI
CAPI offers a number of important features:
l Support for basic call features such as call set-up and
clear-down
l Support for multiple B channels for data and/or voice
connections
l Support for multiple logical data connections within a
single physical connection
l Selection of specific services and protocols for dialing
and for answering incoming calls
l A transparent interface for protocols above Layer 3
l Support for one or several BRIs and PRIs through one or
several ISDN adapters
l Support for multiple concurrent applications
l Message definitions independent of operating systems