<s>
The	O
Common	B-Protocol
ISDN	I-Protocol
Application	I-Protocol
Programming	I-Protocol
Interface	I-Protocol
(	O
short	O
CAPI	O
)	O
is	O
an	O
ISDN-conformant	O
standardized	O
software	B-Application
interface	I-Application
.	O
</s>
<s>
With	O
the	O
help	O
of	O
CAPI	O
,	O
computer	O
software	O
intended	O
for	O
the	O
use	O
with	O
ISDN	B-Protocol
can	O
be	O
provided	O
,	O
without	O
knowledge	O
of	O
the	O
deployed	O
,	O
proprietary	O
ISDN	B-Protocol
card	I-Protocol
.	O
</s>
<s>
Implementations	O
exist	O
for	O
different	O
operating	B-General_Concept
systems	I-General_Concept
,	O
including	O
Linux	B-Application
and	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
Primarily	O
,	O
CAPI	O
was	O
designed	O
for	O
data	O
transfer	O
over	O
ISDN	B-Protocol
.	O
</s>
<s>
The	O
CAPI	O
Interface	O
in	O
its	O
current	O
release	O
(	O
CAPI	O
2.0	O
)	O
supports	O
a	O
variety	O
of	O
signaling	O
protocols	O
(	O
D	B-Protocol
channel	I-Protocol
protocols	O
)	O
,	O
e.g.	O
</s>
<s>
DSS1	B-Protocol
and	O
FTZ	B-Protocol
1	I-Protocol
TR	I-Protocol
6	I-Protocol
.	O
</s>
<s>
Besides	O
popular	O
signaling	O
protocols	O
for	O
ISDN	B-Protocol
,	O
implementations	O
of	O
CAPI	O
for	O
ATM	O
,	O
GSM	O
and	O
VoIP	B-Application
(	O
H.323	B-Protocol
and	O
SIP	B-Application
)	O
exist	O
,	O
thus	O
CAPI	O
applications	O
can	O
be	O
used	O
directly	O
on	O
communications	O
infrastructure	O
.	O
</s>
