Operation Manual

CAPI SoftCompression X75/V42bis
ISDN-Controller C2 – 8 AVM System Architecture 47
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.
With the appropriate TAPI applications, a variety of other fea-
tures are available, including direct dialing of contacts listed
in Microsoft Outlook.
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.
8.4 CAPI SoftCompression X75/V42bis
CAPI SoftCompression X.75/V.42bis is a feature of the ISDN-
Controller C2’s driver software. For data connections using
the X.75 protocol, the controller can perform data compres-
sion 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.
8.5 CAPI SoftFax
The CAPI SoftFax feature allows to send and receive faxes on
all four B channels simultaneously. The ISDN-Controller C2
sends and receives like a standard Group 3 fax device and
supports the following fax protocols:
V.17 (14.4 kbit/s)
G3 Annex F (14.4 kbit/s)
G3 Annex A (color fax)
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