<s>
The	O
3CX	B-Protocol
Phone	I-Protocol
System	I-Protocol
is	O
the	O
software-based	O
private	B-Device
branch	I-Device
exchange	I-Device
(	O
PBX	O
)	O
Phone	O
system	O
developed	O
and	O
marketed	O
by	O
the	O
company	O
,	O
3CX	O
.	O
</s>
<s>
The	O
3CX	B-Protocol
Phone	I-Protocol
System	I-Protocol
is	O
based	O
on	O
the	O
SIP	B-Application
(	O
Session	B-Application
Initiation	I-Application
Protocol	I-Application
)	O
standard	O
and	O
enables	O
extensions	O
to	O
make	O
calls	O
via	O
the	O
public	O
switched	O
telephone	O
network	O
(	O
PSTN	O
)	O
or	O
via	O
Voice	B-Application
over	I-Application
Internet	I-Application
Protocol	I-Application
(	O
VoIP	B-Application
)	O
services	O
on	O
premises	O
,	O
in	O
the	O
cloud	O
,	O
or	O
via	O
a	O
cloud	O
service	O
owned	O
and	O
operated	O
by	O
the	O
3CX	O
company	O
.	O
</s>
<s>
The	O
3CX	B-Protocol
Phone	I-Protocol
System	I-Protocol
is	O
available	O
for	O
Windows	B-Application
,	O
Linux	B-Application
,	O
Raspberry	B-Operating_System
Pi	I-Operating_System
and	O
supports	O
standard	O
SIP	B-Application
soft/hard	O
phones	O
,	O
VoIP	B-Application
services	O
,	O
faxing	O
,	O
voice	O
and	O
web	O
meetings	O
,	O
as	O
well	O
as	O
traditional	O
PSTN	O
phone	O
lines	O
.	O
</s>
<s>
3CX	O
was	O
developed	O
by	O
3CX	O
,	O
an	O
international	O
VoIP	B-Application
IP	O
PBX	O
software	O
development	O
technology	O
company	O
as	O
an	O
open-standards	O
,	O
software-based	O
PBX	O
.	O
</s>
<s>
First	O
published	O
as	O
a	O
free	O
IP	O
PBX	O
product	O
in	O
2006	O
,	O
the	O
product	O
was	O
intended	O
to	O
provide	O
a	O
VoIP	B-Application
product	O
for	O
use	O
in	O
a	O
Microsoft	B-Application
Windows	I-Application
environment	O
.	O
</s>
<s>
Smith	O
on	O
VoIP	B-Application
commented	O
in	O
a	O
blog	O
post	O
about	O
3CX	O
that	O
it	O
was	O
very	O
easy	O
to	O
use	O
.	O
</s>
<s>
3CX	B-Protocol
Phone	I-Protocol
System	I-Protocol
consists	O
of	O
a	O
number	O
of	O
software-based	O
components	O
.	O
</s>
<s>
The	O
PBX	O
,	O
accessed	O
and	O
managed	O
via	O
a	O
web-based	O
management	O
console	O
,	O
softphone	B-Protocol
for	O
Windows	B-Application
,	O
and	O
smartphone	B-Application
clients	O
for	O
iOS	B-Application
and	O
Android	B-Application
.	O
</s>
<s>
The	O
phone	O
system	O
can	O
be	O
used	O
with	O
either	O
SIP	B-Application
phones	O
or	O
the	O
clients	O
,	O
or	O
a	O
combination	O
of	O
the	O
two	O
.	O
</s>
<s>
The	O
PBX	O
provides	O
unified	B-Protocol
communications	I-Protocol
functionality	O
including	O
presence	O
,	O
chat	O
,	O
voicemail	O
to	O
email	O
,	O
fax	O
to	O
email	O
,	O
integrated	O
video	O
conferencing	O
,	O
call	O
conferencing	O
,	O
Live	O
Chat	O
,	O
SMS	O
,	O
and	O
additional	O
integrations	O
with	O
Facebook	O
and	O
a	O
number	O
of	O
CRM	O
platforms	O
.	O
</s>
<s>
Table	O
created	O
according	O
to	O
the	O
"	O
3CX	B-Protocol
Phone	I-Protocol
System	I-Protocol
Build	O
History	O
"	O
.	O
</s>
