<s>
The	O
Telephony	B-Library
Application	I-Library
Programming	I-Library
Interface	I-Library
(	O
TAPI	O
)	O
is	O
a	O
Microsoft	B-Application
Windows	I-Application
API	B-Application
,	O
which	O
provides	O
computer	O
telephony	O
integration	O
and	O
enables	O
PCs	B-Device
running	O
Microsoft	B-Application
Windows	I-Application
to	O
use	O
telephone	O
services	O
.	O
</s>
<s>
It	O
also	O
supports	O
supplementary	O
functions	O
,	O
such	O
as	O
hold	O
,	O
transfer	O
,	O
conference	O
,	O
and	O
call	O
park	O
found	O
in	O
PBX	B-Device
,	O
ISDN	B-Protocol
,	O
and	O
other	O
telephone	O
systems	O
.	O
</s>
<s>
TAPI	O
is	O
used	O
primarily	O
to	O
control	O
either	O
modems	B-Application
or	O
,	O
more	O
recently	O
,	O
to	O
control	O
business	O
telephone	O
system	O
(	O
PBX	B-Device
)	O
handsets	O
.	O
</s>
<s>
When	O
controlling	O
a	O
PBX	B-Device
handset	O
,	O
the	O
driver	O
is	O
provided	O
by	O
the	O
manufacturer	O
of	O
the	O
telephone	O
system	O
.	O
</s>
<s>
Modem	B-Application
connections	O
are	O
by	O
nature	O
first-party	O
.	O
</s>
<s>
TAPI	O
can	O
also	O
be	O
used	O
to	O
control	O
voice-enabled	O
telephony	O
devices	O
,	O
including	O
voice	B-Device
modems	I-Device
and	O
dedicated	O
hardware	O
such	O
as	O
Dialogic	O
cards	O
.	O
</s>
<s>
The	O
first	O
publicly	O
available	O
version	O
of	O
TAPI	O
was	O
version	O
1.3	O
,	O
which	O
was	O
released	O
as	O
a	O
patch	O
on	O
top	O
of	O
Microsoft	B-Application
Windows	I-Application
3.1	O
.	O
</s>
<s>
With	O
Microsoft	B-Application
Windows	I-Application
95	I-Application
,	O
TAPI	O
was	O
integrated	O
into	O
the	O
operating	O
system	O
.	O
</s>
<s>
The	O
first	O
version	O
on	O
Windows	B-Application
95	I-Application
was	O
TAPI	O
1.4	O
.	O
</s>
<s>
The	O
TAPI	O
standard	O
supports	O
both	O
connections	O
from	O
individual	O
computers	O
and	O
LAN	B-General_Concept
connections	O
serving	O
any	O
number	O
of	O
computers	O
.	O
</s>
<s>
TAPI	O
2.0	O
was	O
introduced	O
with	O
Windows	B-Device
NT	I-Device
4.0	O
.	O
</s>
<s>
Version	O
2.0	O
was	O
the	O
first	O
version	O
on	O
the	O
Windows	B-Device
NT	I-Device
platform	O
.	O
</s>
<s>
It	O
made	O
a	O
significant	O
step	O
forward	O
by	O
supporting	O
ACD	O
and	O
PBX-specific	O
functionality	O
.	O
</s>
<s>
This	O
version	O
of	O
TAPI	O
was	O
available	O
as	O
a	O
downloadable	O
update	O
and	O
was	O
the	O
first	O
version	O
to	O
be	O
supported	O
on	O
both	O
the	O
Microsoft	B-Application
Windows	I-Application
95	I-Application
and	O
Windows	O
NT/2000	O
platforms	O
.	O
</s>
<s>
TAPI	O
3.0	O
was	O
released	O
in	O
1999	O
together	O
with	O
Windows	B-Application
2000	I-Application
.	O
</s>
<s>
This	O
version	O
enables	O
IP	B-Application
telephony	I-Application
(	O
VoIP	B-Application
)	O
by	O
providing	O
simple	O
and	O
generic	O
methods	O
for	O
making	O
connections	O
between	O
two	O
(	O
using	O
H.323	B-Protocol
)	O
or	O
more	O
(	O
using	O
IP	B-Protocol
multicast	I-Protocol
)	O
computers	O
and	O
now	O
also	O
offers	O
the	O
ability	O
to	O
access	O
any	O
media	O
stream	O
(	O
MSP	O
driver	O
)	O
involved	O
in	O
the	O
connection	O
.	O
</s>
<s>
Windows	B-Application
XP	I-Application
included	O
both	O
TAPI	O
3.1	O
and	O
TAPI	O
2.2	O
.	O
</s>
<s>
TAPI	O
3.1	O
supports	O
the	O
Microsoft	B-Application
Component	I-Application
Object	I-Application
Model	I-Application
and	O
provides	O
a	O
set	O
of	O
COM	B-Application
objects	I-Application
to	O
application	O
programmers	O
.	O
</s>
<s>
A	O
USB	B-Protocol
Phone	O
TSP	O
(	O
Telephony	O
Service	O
Provider	O
)	O
was	O
also	O
included	O
which	O
allows	O
an	O
application	O
to	O
control	O
a	O
USB	B-Protocol
phone	O
and	O
use	O
it	O
as	O
a	O
streaming	O
endpoint	O
.	O
</s>
<s>
TAPI	O
3.0	O
or	O
TAPI	O
3.1	O
are	O
not	O
available	O
on	O
operating	O
systems	O
earlier	O
than	O
Windows	B-Application
2000	I-Application
and	O
Windows	B-Application
XP	I-Application
respectively	O
.	O
</s>
<s>
The	O
Telephony	B-Application
Server	I-Application
Application	I-Application
Programming	I-Application
Interface	I-Application
(	O
TSAPI	B-Application
)	O
is	O
a	O
similar	O
standard	O
developed	O
by	O
Novell	O
for	O
NetWare	B-Operating_System
servers	O
.	O
</s>
<s>
Area	O
code	O
,	O
subaddress	O
and	O
name	O
are	O
optional	O
;	O
the	O
latter	O
can	O
carry	O
extension	O
number	O
for	O
direct	B-Device
inward	I-Device
dialing	I-Device
and	O
calling	O
party	O
name	O
,	O
as	O
used	O
by	O
ISDN/E1/T1	O
telecommunication	O
protocols	O
.	O
</s>
<s>
Dialing	O
rules	O
are	O
used	O
to	O
transform	O
the	O
canonical	O
phone	O
number	O
into	O
a	O
dialable	O
calling	O
sequence	O
for	O
the	O
modem	B-Application
,	O
depending	O
on	O
the	O
user	O
's	O
location	O
.	O
</s>
<s>
;	O
which	O
correspond	O
to	O
the	O
Dial	O
command	O
of	O
the	O
Hayes	B-Device
AT	I-Device
command	I-Device
set	I-Device
.	O
</s>
<s>
-	O
indicates	O
that	O
the	O
user	O
is	O
to	O
be	O
prompted	O
before	O
continuing	O
(	O
results	O
in	O
an	O
application	O
error	O
since	O
the	O
API	B-Application
has	O
no	O
means	O
to	O
implement	O
a	O
user	O
prompt	O
)	O
;	O
</s>
<s>
TAPI	O
2.x	O
and	O
earlier	O
versions	O
were	O
written	O
in	O
C	B-Language
;	O
the	O
API	B-Application
uses	O
pointers	O
to	O
structures	O
.	O
</s>
<s>
Consequently	O
,	O
TAPI	O
2.x	O
is	O
easy	O
to	O
access	O
from	O
C	B-Language
or	O
C++	B-Language
applications	O
,	O
but	O
it	O
can	O
be	O
awkward	O
to	O
use	O
from	O
many	O
other	O
programming	O
languages	O
.	O
</s>
<s>
TAPI	O
3.x	O
was	O
designed	O
with	O
a	O
Component	B-Application
Object	I-Application
Model	I-Application
(	O
COM	O
)	O
interface	O
.	O
</s>
<s>
This	O
was	O
done	O
with	O
the	O
intent	O
of	O
making	O
it	O
accessible	O
to	O
higher	O
level	O
applications	O
such	O
as	O
developed	O
in	O
VB	B-Language
or	O
other	O
environments	O
that	O
provide	O
easy	O
access	O
to	O
COM	O
but	O
do	O
n't	O
deal	O
with	O
C-style	O
pointers	O
.	O
</s>
<s>
However	O
,	O
Mark	O
Smith	O
has	O
provided	O
a	O
managed	O
C++	B-Language
library	O
called	O
ITAPI3	O
and	O
a	O
2.x	O
wrapper	O
for	O
.NET	O
.	O
</s>
<s>
On	O
Windows	O
,	O
TAPI	O
support	O
was	O
almost	O
universal	O
in	O
telephony	O
hardware	O
such	O
as	O
voice	B-Device
modems	I-Device
(	O
both	O
internal	O
and	O
external	O
)	O
and	O
computer	O
expansion	O
boards	O
such	O
as	O
Dialogic	O
telephony	O
cards	O
.	O
</s>
<s>
The	O
only	O
notable	O
exception	O
who	O
never	O
natively	O
supported	O
TAPI	O
was	O
the	O
Avaya	O
Communication	O
Manager	O
,	O
which	O
relied	O
solely	O
on	O
the	O
TSAPI	B-Application
interface	O
for	O
connectivity	O
.	O
</s>
<s>
Many	O
PBX	B-Device
systems	O
provide	O
TAPI-compliant	O
modem	B-Application
interfaces	O
.	O
</s>
<s>
TAPI	O
compatible	O
PBX	B-Device
solutions	O
include	O
Aastra	O
(	O
400/800	O
)	O
,	O
Aastra	O
(	O
MX-ONE	O
)	O
,	O
Alcatel	O
(	O
OXO/OXE	O
)	O
,	O
Avaya	O
(	O
BCM	O
,	O
IP	O
Office	O
)	O
,	O
Cisco	O
(	O
Call	O
Manager	O
)	O
,	O
Ericsson-LG	B-Protocol
(	O
eMG80	O
,	O
iPECS	O
,	O
ipLDK	O
)	O
,	O
NEC-Philips	O
(	O
iS3000	O
,	O
IPC100/500	O
)	O
,	O
NEC	O
(	O
SL1000	O
,	O
SV8100/9100	O
)	O
,	O
Nitsuko	O
(	O
DXE600/328	O
)	O
,	O
Panasonic	O
(	O
KX-TDA/TDE/NCP	O
,	O
KX-NS1000	O
)	O
,	O
Samsung	B-Application
(	O
OfficeServ	O
)	O
,	O
Unify	O
(	O
3000/4000	O
,	O
Openscape	O
Office	O
)	O
,	O
ShoreTel	O
,	O
and	O
ZyXEL	O
(	O
X6004/X2002	O
)	O
.	O
</s>
