Specifications

Benefits of CAPI
62 ISDN-Controller B1 PCI v4.0 – 12 AVM System Architecture
Benefits of CAPI
CAPI has evolved into an internationally recognized standard.
The key factor in this development has been the numerous ad-
vantages offered by this uniform interface: independence from
specific manufacturers and resulting high investment security,
a wide variety of compatible applications for all kinds of oper-
ating systems and ISDN protocols, etc. ISDN (Integrated Servic-
es Digital Network) is becoming attractive for more and more
telecommunications users since it affords fast and reliable
transfer of information in many different forms.
This CAPI 2.0 version has all the advantages of an open inter-
face, and covers most of the ISDN features. Since the CAPI
interface handles most ISDN subscriber interface control
functions, these no longer have to be programmed. This sim-
plifies the development of ISDN applications. Furthermore,
applications no longer have to be tailored to national or
manufacturer-specific systems, so that a greater variety of
applications is available.
For more information about the CAPI applications interface,
see the CAPI Association’s Internet site:
http://www.capi.org
Features of CAPI
CAPI offers a number of important features:
z Support for basic call features such as establishing and
clearing a connection
z Multiple B channel for data and/or voice connections
z Supports multiple logical data connections within a sin-
gle physical connection
z Selection of specific services and protocols on dialing
and in answering incoming calls
z Transparent interface for protocols above OSI Layer 3
z Support for one or several BRIs and PRIs through one or
several ISDN adapters
z Support for multiple concurrent applications
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