Specifications

Benefits of CAPI
ISDN-Controller B1 PCI v4.0 – 14 AVM System Architecture 67
Benefits of CAPI
CAPI has evolved into an internationally recognized stan-
dard. Important for this are the many advantages this
uniform interface offers: independence from specific manu-
facturers and resulting high investment security, a wide
variety of compatible applications for various operating
systems and ISDN protocols, etc. ISDN (Integrated Services
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 in-
terface, and covers most of the ISDN features. Since the
CAPI interface handles most ISDN subscriber interface con-
trol functions, these no longer have to be programmed. This
simplifies the development of ISDN applications. Further-
more, 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:
www.capi.org
Features of CAPI
CAPI offers a number of important features:
 Support for basic call features such as establishing
and clearing a connection
 Multiple B channel for data and/or voice connections
 Support for multiple logical data connections within a
single physical connection
 Selection of specific services and protocols on dialing
and in answering incoming calls
 Transparent interface for protocols above OSI Layer 3
 Support for one or several BRIs and PRIs through one
or several ISDN adapters
 Support for multiple concurrent applications