<s>
PacketCable	B-Device
network	O
is	O
a	O
technology	O
specification	O
defined	O
by	O
the	O
industry	O
consortium	O
CableLabs	O
for	O
using	O
Internet	B-Protocol
Protocol	I-Protocol
(	O
IP	O
)	O
networks	O
to	O
deliver	O
multimedia	O
services	O
,	O
such	O
as	O
IP	B-Application
telephony	I-Application
,	O
conferencing	O
,	O
and	O
interactive	O
gaming	O
on	O
a	O
cable	B-Device
television	O
infrastructure	O
.	O
</s>
<s>
The	O
PacketCable	B-Device
technology	O
is	O
based	O
on	O
the	O
DOCSIS	B-Protocol
base	O
with	O
extensions	O
that	O
enable	O
cable	B-Device
operators	O
to	O
deliver	O
data	O
and	O
voice	O
traffic	O
efficiently	O
using	O
a	O
single	O
high-speed	O
,	O
quality-of-service	O
(	O
QoS	O
)	O
-enabled	O
broadband	O
(	O
cable	B-Device
)	O
architecture	O
.	O
</s>
<s>
The	O
PacketCable	B-Device
effort	O
dates	O
back	O
to	O
1997	O
when	O
cable	B-Device
operators	O
identified	O
the	O
need	O
for	O
a	O
real-time	O
multimedia	O
architecture	O
to	O
support	O
the	O
delivery	O
of	O
advanced	O
multimedia	O
services	O
over	O
the	O
DOCSIS	B-Protocol
architecture	O
.	O
</s>
<s>
The	O
original	O
PacketCable	B-Device
specifications	O
were	O
based	O
on	O
the	O
physical	O
network	O
characteristics	O
of	O
operators	O
in	O
the	O
U.S.	O
For	O
the	O
European	O
market	O
,	O
Cable	B-Device
Europe	O
Labs	O
,	O
maintains	O
a	O
separate	O
,	O
but	O
equivalent	O
effort	O
,	O
EuroPacketCable	B-Device
,	O
based	O
on	O
European	O
network	O
implementations	O
.	O
</s>
<s>
PacketCable	B-Device
interconnects	O
three	O
network	O
types	O
:	O
</s>
<s>
Network-Based	B-Protocol
Call	I-Protocol
Signaling	I-Protocol
Protocol	O
Specification	O
(	O
NCS	O
)	O
which	O
is	O
an	O
MGCP	B-Protocol
extension	O
for	O
analog	O
residential	O
Media	O
Gateways	O
-	O
the	O
NCS	O
specification	O
,	O
which	O
is	O
derived	O
from	O
the	O
IETF	O
MGCP	B-Protocol
RFC	O
2705	O
,	O
details	O
VoIP	B-Application
signalling	O
.	O
</s>
<s>
The	O
Packet	O
Cable	B-Device
group	O
has	O
defined	O
more	O
messages	O
and	O
features	O
than	O
the	O
IETF	O
.	O
</s>
<s>
PacketCable	B-Device
1.0	O
comprises	O
eleven	O
specifications	O
and	O
six	O
technical	O
reports	O
which	O
define	O
call	O
signaling	O
,	O
quality	O
of	O
service	O
(	O
QoS	O
)	O
,	O
codec	B-General_Concept
usage	O
,	O
client	O
provisioning	O
,	O
billing	O
event	O
message	O
collection	O
,	O
public	O
switched	O
telephone	O
network	O
(	O
PSTN	O
)	O
interconnection	O
,	O
and	O
security	O
interfaces	O
for	O
implement	O
a	O
single-zone	O
PacketCable	B-Device
solution	O
for	O
residential	O
Internet	B-Protocol
Protocol	I-Protocol
(	O
IP	O
)	O
voice	O
services	O
.	O
</s>
<s>
PacketCable	B-Device
1.5	O
contains	O
additional	O
capabilities	O
over	O
PacketCable	B-Device
1.0	O
.	O
</s>
<s>
The	O
standard	O
covers	O
21	O
specifications	O
and	O
one	O
technical	O
report	O
which	O
together	O
define	O
call	O
signaling	O
,	O
quality	O
of	O
service	O
(	O
QoS	O
)	O
,	O
coders	O
,	O
client	O
provisioning	O
,	O
billing	O
event	O
message	O
collection	O
,	O
PSTN	O
interconnection	O
,	O
and	O
security	O
interfaces	O
for	O
implementing	O
a	O
single-zone	O
or	O
multi-zone	O
PacketCable	B-Device
solution	O
for	O
residential	O
Internet	B-Protocol
Protocol	I-Protocol
(	O
IP	O
)	O
voice	O
services	O
.	O
</s>
<s>
Version	O
2.0	O
introduces	O
IMS	O
Release	O
7	O
IP	B-Protocol
Multimedia	I-Protocol
Subsystem	I-Protocol
into	O
the	O
core	O
of	O
the	O
architecture	O
.	O
</s>
<s>
PacketCable	B-Device
uses	O
a	O
simplified	O
IMS	O
in	O
some	O
areas	O
and	O
enhances	O
it	O
in	O
some	O
cable-specific	O
areas	O
.	O
</s>
<s>
PacketCable	B-Device
defined	O
Delta	O
specs	O
related	O
to	O
the	O
most	O
important	O
IMS	O
specs	O
from	O
3GPP	O
.	O
</s>
<s>
VoIP	B-Application
services	O
based	O
on	O
the	O
PacketCable	B-Device
architecture	O
are	O
being	O
widely	O
deployed	O
by	O
operators	O
:	O
</s>
