<s>
The	O
FreePBX	B-Protocol
Distro	I-Protocol
is	O
a	O
freeware	B-License
unified	B-Protocol
communications	I-Protocol
software	O
system	O
that	O
consists	O
of	O
a	O
graphical	O
user	O
interface	O
(	O
GUI	O
)	O
for	O
configuring	O
,	O
controlling	O
,	O
and	O
managing	O
Asterisk	B-Language
PBX	I-Language
software	O
.	O
</s>
<s>
The	O
FreePBX	B-Protocol
Distro	I-Protocol
includes	O
packages	O
that	O
offer	O
VoIP	B-Application
,	O
PBX	O
,	O
Fax	O
,	O
IVR	O
,	O
voice-mail	O
and	O
email	O
functions	O
.	O
</s>
<s>
The	O
FreePBX	B-Protocol
Distro	I-Protocol
Linux	B-Application
distribution	I-Application
is	O
based	O
on	O
CentOS	O
,	O
which	O
maintains	O
binary	O
compatibility	O
with	O
Red	O
Hat	O
Enterprise	O
Linux	B-Application
.	O
</s>
<s>
FreePBX	B-Application
has	O
contributed	O
to	O
the	O
popularity	O
of	O
Asterisk	B-Language
.	O
</s>
<s>
The	O
Official	O
FreePBX	B-Protocol
Distro	I-Protocol
is	O
installed	O
from	O
a	O
CD-ROM	O
image	O
available	O
by	O
web	O
download	O
,	O
that	O
includes	O
the	O
system	O
CentOS	O
,	O
Asterisk	B-Language
,	O
FreePBX	B-Application
GUI	O
and	O
assorted	O
dependencies	O
.	O
</s>
<s>
The	O
FreePBX	B-Protocol
Distro	I-Protocol
has	O
built-in	O
support	O
for	O
cards	O
from	O
multiple	O
vendors	O
,	O
including	O
Digium	B-Protocol
,	O
OpenVox	O
,	O
Alto	O
,	O
Rhino	O
Equipment	O
,	O
Xorcom	O
and	O
Sangoma	O
.	O
</s>
<s>
The	O
FreePBX	B-Protocol
Distro	I-Protocol
supports	O
a	O
large	O
number	O
of	O
phone	O
models	O
via	O
open-source	O
modules	O
.	O
</s>
<s>
FreePBX	B-Application
made	O
its	O
debut	O
in	O
2004	O
as	O
the	O
AMP	O
project	O
(	O
Asterisk	B-Language
Management	O
Portal	O
)	O
.	O
</s>
<s>
The	O
FreePBX	B-Protocol
Distro	I-Protocol
was	O
released	O
in	O
2011	O
as	O
an	O
All-In-One	O
solution	O
for	O
building	O
a	O
PBX	O
using	O
Asterisk	B-Language
,	O
CentOS	O
and	O
FreePBX	B-Application
.	O
</s>
<s>
FreePBX	B-Application
has	O
over	O
1	O
million	O
active	O
production	O
PBXs	O
and	O
over	O
20,000	O
new	O
systems	O
added	O
each	O
month	O
.	O
</s>
<s>
Supported	O
PBX	O
phone	O
manufacturers	O
include	O
Aastra	O
Technologies	O
,	O
Algo	O
,	O
AND	O
,	O
Audiocodes	O
,	O
Cisco	O
Systems	O
,	O
Cyberdata	O
,	O
Digium	B-Protocol
,	O
Grandstream	O
,	O
Mitel	O
,	O
Panasonic	O
,	O
Polycom	O
,	O
Sangoma	O
,	O
Snom	O
,	O
Xorcom	O
and	O
Yealink	O
.	O
</s>
<s>
The	O
core	O
telephony	O
engine	O
is	O
Asterisk	B-Language
(	O
PBX	O
)	O
,	O
as	O
configured	O
by	O
the	O
Open	O
Source	O
FreePBX	B-Application
GUI	O
.	O
</s>
<s>
The	O
latest	O
stable	O
release	O
is	O
FreePBX	B-Protocol
Distro	I-Protocol
Stable	O
SNG7-PBX16-64bit-2208-2	O
based	O
on	O
these	O
main	O
components	O
:	O
</s>
