<s>
An	O
analog	B-Protocol
telephone	I-Protocol
adapter	I-Protocol
(	O
ATA	O
)	O
is	O
a	O
device	O
for	O
connecting	O
traditional	O
analog	O
telephones	O
,	O
fax	O
machines	O
,	O
and	O
similar	O
customer-premises	O
devices	O
to	O
a	O
digital	O
telephone	O
system	O
or	O
a	O
voice	B-Application
over	I-Application
IP	I-Application
telephony	O
network	O
.	O
</s>
<s>
The	O
ATA	O
provides	O
dial	O
tone	O
,	O
Ringing	O
Generator	O
,	O
DC	O
power	O
,	O
caller	O
ID	O
data	O
and	O
other	O
standard	O
telephone	O
line	O
signaling	O
(	O
known	O
collectively	O
as	O
BORSCHT	B-Device
)	O
to	O
the	O
telephone	O
connected	O
to	O
a	O
modular	O
jack	O
.	O
</s>
<s>
Using	O
such	O
an	O
ATA	O
,	O
it	O
is	O
possible	O
to	O
connect	O
a	O
conventional	O
telephone	O
to	O
a	O
remote	O
VoIP	B-Application
server	O
.	O
</s>
<s>
The	O
ATA	O
communicates	O
with	O
the	O
server	O
using	O
a	O
protocol	O
such	O
as	O
H.323	B-Protocol
,	O
SIP	B-Application
,	O
MGCP	B-Protocol
,	O
SCCP	B-Protocol
or	O
IAX	B-Protocol
,	O
and	O
encodes	O
and	O
decodes	O
the	O
voice	O
signal	O
using	O
a	O
voice	O
codec	O
such	O
as	O
G.711	B-Algorithm
,	O
G.729	B-Algorithm
,	O
GSM	O
,	O
iLBC	B-Algorithm
or	O
others	O
.	O
</s>
<s>
Since	O
the	O
ATA	O
communicates	O
directly	O
with	O
the	O
VoIP	B-Application
server	O
,	O
it	O
does	O
not	O
require	O
a	O
personal	O
computer	O
or	O
any	O
software	O
such	O
as	O
a	O
softphone	B-Protocol
.	O
</s>
<s>
Often	O
an	O
ATA	O
is	O
connected	O
between	O
an	O
IP	B-Protocol
network	I-Protocol
(	O
such	O
as	O
a	O
broadband	O
connection	O
)	O
and	O
an	O
existing	O
telephone	O
jack	O
in	O
a	O
residence	O
to	O
provide	O
service	O
in	O
all	O
locations	O
of	O
the	O
residence	O
where	O
telephones	O
are	O
connected	O
.	O
</s>
