<s>
Telephony	B-Application
Server	I-Application
Application	I-Application
Programming	I-Application
Interface	I-Application
was	O
a	O
computer	O
telephony	O
integration	O
standard	O
developed	O
and	O
promoted	O
by	O
Novell	O
and	O
AT&T	O
.	O
</s>
<s>
It	O
consisted	O
of	O
a	O
number	O
of	O
call	O
control	O
commands	O
for	O
switching	O
calls	O
,	O
voice	O
mail	O
and	O
call	O
logging	O
using	O
NetWare	B-Operating_System
servers	O
.	O
</s>
<s>
Unlike	O
the	O
competing	O
Telephony	B-Library
Application	I-Library
Programming	I-Library
Interface	I-Library
from	O
Microsoft	O
and	O
Intel	O
,	O
it	O
was	O
a	O
server-based	O
system	O
that	O
did	O
not	O
expect	O
client-side	O
equipment	O
to	O
handle	O
call	O
switching	O
.	O
</s>
<s>
This	O
was	O
important	O
to	O
AT&T	O
,	O
which	O
sold	O
large	O
telephone	O
switches	O
that	O
Telephony	B-Application
Server	I-Application
Application	I-Application
Programming	I-Application
Interface	I-Application
was	O
intended	O
to	O
work	O
with	O
.	O
</s>
<s>
Telephony	B-Application
Server	I-Application
Application	I-Application
Programming	I-Application
Interface	I-Application
consisted	O
of	O
two	O
primary	O
parts	O
,	O
the	O
application	B-Application
programming	I-Application
interface	I-Application
itself	O
,	O
and	O
a	O
"	O
telephony	O
service	O
provider	O
"	O
that	O
ran	O
on	O
a	O
server	B-Application
and	O
talked	O
to	O
clients	O
.	O
</s>
<s>
Novell	O
produced	O
one	O
such	O
provider	O
,	O
"	O
TServer	O
"	O
that	O
ran	O
,	O
unsurprisingly	O
,	O
on	O
NetWare	B-Operating_System
servers	O
.	O
</s>
<s>
NetWare	B-Operating_System
acted	O
primarily	O
as	O
the	O
operating	B-General_Concept
system	I-General_Concept
for	O
TServer	O
to	O
run	O
within	O
,	O
although	O
TServer	O
did	O
make	O
use	O
of	O
NetWare	B-Application
Directory	I-Application
Services	I-Application
for	O
security	O
and	O
provisioning	O
.	O
</s>
<s>
The	O
whole	O
system	O
from	O
client-side	O
drivers	O
to	O
server	B-Application
to	O
private	O
branch	O
exchange	O
driver	O
was	O
known	O
as	O
"	O
NetWare	B-Operating_System
Telephony	O
Services	O
"	O
,	O
at	O
least	O
when	O
using	O
Novell	O
software	O
.	O
</s>
<s>
When	O
used	O
with	O
one	O
of	O
these	O
switches	O
,	O
the	O
driver	O
between	O
the	O
server	B-Application
and	O
the	O
switch	O
was	O
"	O
thin	O
"	O
.	O
</s>
<s>
The	O
client-side	O
application	B-Application
programming	I-Application
interface	I-Application
was	O
available	O
for	O
Windows	B-Application
3.1	I-Application
,	O
Windows	B-Application
95	I-Application
,	O
Windows	B-Device
NT	I-Device
,	O
OS/2	B-Application
,	O
Mac	B-Application
OS	I-Application
,	O
UnixWare	B-Operating_System
and	O
Linux	B-Application
.	O
</s>
<s>
Telephony	B-Application
Server	I-Application
Application	I-Application
Programming	I-Application
Interface	I-Application
was	O
created	O
in	O
an	O
era	O
when	O
major	O
telephony	O
vendors	O
were	O
promoting	O
a	O
vision	O
of	O
wide-area	O
networking	O
based	O
on	O
dedicated	O
circuit-switched	O
links	O
.	O
</s>
<s>
Apple	O
Computer	O
was	O
promoting	O
GeoPort	B-Device
as	O
the	O
computer-end	O
of	O
such	O
a	O
system	O
,	O
and	O
selected	O
Telephony	B-Application
Server	I-Application
Application	I-Application
Programming	I-Application
Interface	I-Application
as	O
the	O
messaging	O
protocol	O
.	O
</s>
<s>
The	O
various	O
vendors	O
formed	O
the	O
Versit	B-Protocol
Consortium	I-Protocol
and	O
published	O
"	O
The	O
Versit	B-Protocol
CTI	O
Encyclopedia.	O
"	O
</s>
<s>
Additionally	O
,	O
Versit	B-Protocol
allowed	O
that	O
data	O
to	O
be	O
switched	O
to	O
the	O
computer	O
using	O
GeoPort	B-Device
or	O
a	O
number	O
of	O
other	O
connection	O
options	O
.	O
</s>
