<s>
Internet	B-Protocol
Protocol	I-Protocol
Device	I-Protocol
Control	I-Protocol
(	O
IPDC	O
)	O
is	O
a	O
1998	O
specification	O
of	O
a	O
communications	O
protocol	O
for	O
voice	B-Application
over	I-Application
Internet	I-Application
Protocol	I-Application
(	O
VoIP	B-Application
)	O
telephony	O
,	O
developed	O
by	O
Level	O
3	O
Communications	O
.	O
</s>
<s>
IPDC	O
divides	O
the	O
operation	O
of	O
telephony	O
gateways	O
between	O
intelligent	O
call	O
routers	O
in	O
an	O
Internet	B-Protocol
Protocol	I-Protocol
(	O
IP	O
)	O
network	O
and	O
simple	O
media	O
gateways	O
at	O
the	O
edge	O
of	O
the	O
IP	O
network	O
and	O
the	O
public	O
switched	O
telephone	O
network	O
(	O
PSTN	O
)	O
.	O
</s>
<s>
Internet	B-Protocol
Protocol	I-Protocol
Device	I-Protocol
Control	I-Protocol
was	O
fused	O
with	O
the	O
Simple	B-Protocol
Gateway	I-Protocol
Control	I-Protocol
Protocol	I-Protocol
(	O
SGCP	B-Protocol
)	O
,	O
a	O
project	O
independently	O
in	O
progress	O
at	O
Bellcore	O
,	O
to	O
form	O
the	O
Media	B-Protocol
Gateway	I-Protocol
Control	I-Protocol
Protocol	I-Protocol
(	O
MGCP	O
)	O
.	O
</s>
<s>
This	O
group	O
of	O
protocols	O
employs	O
the	O
media	B-Protocol
gateway	I-Protocol
control	I-Protocol
protocol	I-Protocol
architecture	O
that	O
is	O
also	O
the	O
foundation	O
of	O
MEGACO/H.248	O
,	O
a	O
similar	O
protocol	O
which	O
became	O
a	O
standards-track	O
protocol	O
at	O
the	O
Internet	O
Engineering	O
Task	O
Force	O
(	O
IETF	O
)	O
.	O
</s>
