Benefits of CAPI
ISDN-Controller B1 v3.0 – 13 AVM System Architecture
79
Benefits of CAPI
CAPI has evolved into an internationally recognized stand-
ard. The key factor in this development has been the numer-
ous advantages offered by this uniform interface: indepen-
dence from specific manufacturers and resulting high invest-
ment security, a wide variety of compatible applications for
all kinds of operating systems and ISDN protocols, etc. ISDN
(the
I
ntegrated
S
ervices
D
igital
N
etwork) is becoming attrac-
tive for more and more companies 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 ISDN features. Since
the CAPI interface handles most ISDN subscriber interface
control functions, these no longer have to be programmed.
This simplifies the development of ISDN applications. Fur-
thermore, applications no longer have to be tailored to na-
tional or manufacturer-specific systems, so that a greater va-
riety of applications is available.
For more information about the CAPI applications interface,
see the following Internet site:
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 channel
l
Selection of specific services and protocols on dialing
and in answering incoming calls
l
Transparent interface for protocols above OSI Layer 3
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