Specifications

AVM ISDN TAPI Services for CAPI
66 ISDN-Controller B1 PCI v4.0 – 12 AVM System Architecture
AVM ISDN TAPI Services for CAPI
AVM ISDN TAPI Services for CAPI are drivers which can be
used to implement TAPI applications with AVM ISDN-Control-
lers universally in Windows.
TAPI (Telephony Application Programming Interface) is a te-
lephony interface by Microsoft that allows telephony appli-
cations to be controlled from Windows. Using AVM ISDN TAPI
Services for CAPI, phone calls can be made or voice-mail sys-
tems controlled on the computer. For instance, Windows’s
“Phone Dialer” can be used to establish connections to ana-
log or ISDN phones. The conversation then takes place using
a sound card and a headset or speakers and a microphone.
Suitable TAPI applications can make use of numerous other
features, such as direct telephone dialing to communication
partners listed in programs such as Microsoft Outlook. In the
operating systems Windows XP and Windows 2000, MS Fax
service may also be used. Please read the relevant sections
in the Online Help for instructions.
TAPI applications based on the Microsoft standard TAPI 2.1
or higher can be used in combination with AVM ISDN-Con-
trollers and the AVM ISDN TAPI Services for CAPI.
12.4 CAPI SoftCompression X75/V42bis
CAPI SoftCompression X75/V42bis is a feature of the ISDN-
Controller B1 PCI v4.0’s driver software. The controller can
perform data compression in accordance with the V.42bis
standard. This reduces transfer times and connection costs.
When the driver software is installed, CAPI SoftCompression
X.75/V.42bis is activated by default. Upon request by CAPI
applications that support the V.42bis standard, data com-
pression is negotiated with the remote system for the dura-
tion of a connection.
If you use older ISDN applications that do not support this
method of data compression, you have the option of activat-
ing data compression directly in the driver software of the
ISDN-Controller B1 PCI v4.0. This switches on data compres-
sion for all ISDN connections so that the controller will
attempt to negotiate V.42bis data compression with the
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