<s>
The	O
CAMEL	B-Protocol
Application	I-Protocol
Part	I-Protocol
(	O
CAP	O
)	O
is	O
a	O
signalling	O
protocol	O
used	O
in	O
the	O
Intelligent	O
Network	O
(	O
IN	O
)	O
architecture	O
.	O
</s>
<s>
CAP	O
is	O
based	O
on	O
a	O
subset	O
of	O
the	O
ETSI	O
Core	O
and	O
allows	O
for	O
the	O
implementation	O
of	O
carrier-grade	O
,	O
value	O
added	O
services	O
such	O
as	O
unified	O
messaging	O
,	O
prepaid	O
,	O
fraud	O
control	O
and	O
Freephone	O
in	O
both	O
the	O
GSM	O
voice	O
and	O
GPRS	B-General_Concept
data	O
networks	O
.	O
</s>
<s>
It	O
builds	O
upon	O
established	O
practices	O
in	O
the	O
fixed	O
line	O
telephony	O
business	O
that	O
are	O
generally	O
classed	O
under	O
the	O
heading	O
of	O
(	O
Intelligent	O
Network	O
Application	O
Part	O
)	O
or	O
INAP	B-Protocol
CS-2	O
protocol	O
.	O
</s>
<s>
The	O
CAMEL	B-Protocol
Application	I-Protocol
Part	I-Protocol
(	O
CAP	O
)	O
portable	O
,	O
software	O
provides	O
mechanisms	O
to	O
support	O
operator	O
services	O
beyond	O
the	O
standard	O
GSM	O
services	O
for	O
subscribers	O
roaming	O
within	O
or	O
outside	O
the	O
Home	O
PLMN	O
(	O
HPLMN	O
)	O
.	O
</s>
<s>
the	O
definition	O
of	O
the	O
operations	O
transferred	O
between	O
entities	O
,	O
defined	O
using	O
Abstract	B-Protocol
Syntax	I-Protocol
Notation	I-Protocol
One	I-Protocol
(	O
ASN.1	B-Protocol
)	O
;	O
</s>
