<s>
Network-based	B-Protocol
Call	I-Protocol
Signaling	I-Protocol
(	O
NCS	O
)	O
is	O
a	O
profile	O
of	O
the	O
Media	B-Protocol
Gateway	I-Protocol
Control	I-Protocol
Protocol	I-Protocol
(	O
MGCP	O
)	O
for	O
use	O
in	O
PacketCable	B-Device
applications	O
for	O
voice-over-IP	B-Application
.	O
</s>
<s>
A	O
network	O
implementing	O
NCS	O
is	O
designed	O
according	O
to	O
the	O
media	B-Protocol
gateway	I-Protocol
control	I-Protocol
protocol	I-Protocol
architecture	O
for	O
interconnecting	O
a	O
packet	O
network	O
with	O
the	O
traditional	O
public	O
switched	O
telephone	O
network	O
(	O
PSTN	O
)	O
.	O
</s>
<s>
It	O
is	O
one	O
layer	O
of	O
the	O
PacketCable	B-Device
suite	O
of	O
specifications	O
and	O
relies	O
upon	O
companion	O
protocol	O
specifications	O
to	O
provide	O
complete	O
end-to-end	O
telecommunication	O
functionality	O
.	O
</s>
<s>
Network-based	B-Protocol
Call	I-Protocol
Signaling	I-Protocol
is	O
a	O
modification	O
of	O
the	O
Media	B-Protocol
Gateway	I-Protocol
Control	I-Protocol
Protocol	I-Protocol
(	O
MGCP	O
)	O
.	O
</s>
<s>
NCS	O
provides	O
a	O
PacketCable	B-Device
profile	O
of	O
an	O
application	O
programming	O
interface	O
(	O
MGCI	O
)	O
,	O
and	O
a	O
corresponding	O
protocol	O
(	O
MGCP	O
)	O
for	O
controlling	O
voice-over-IP	B-Application
(	O
VoIP	B-Application
)	O
embedded	O
clients	O
from	O
external	O
call	O
control	O
elements	O
.	O
</s>
<s>
The	O
modification	O
of	O
MGCP	O
in	O
the	O
NCS	O
profile	O
include	O
the	O
following	O
:	O
NCS	O
only	O
aims	O
at	O
supporting	O
PacketCable-embedded	O
clients	O
.	O
</s>
