<s>
FreeSWITCH	B-Language
is	O
a	O
free	B-License
and	I-License
open-source	I-License
telephony	O
software	O
for	O
real-time	B-Protocol
communication	I-Protocol
protocols	O
using	O
audio	O
,	O
video	O
,	O
text	O
and	O
other	O
forms	O
of	O
media	O
.	O
</s>
<s>
The	O
software	O
has	O
applications	O
in	O
WebRTC	B-Protocol
,	O
voice	B-Application
over	I-Application
Internet	I-Application
Protocol	I-Application
(	O
VoIP	B-Application
)	O
,	O
video	O
transcoding	O
,	O
Multipoint	B-Protocol
Control	I-Protocol
Unit	I-Protocol
(	O
MCU	O
)	O
functionality	O
and	O
supports	O
Session	B-Application
Initiation	I-Application
Protocol	I-Application
(	O
SIP	O
)	O
features	O
.	O
</s>
<s>
The	O
software	O
runs	O
on	O
Linux	B-Application
,	O
Windows	B-Application
,	O
macOS	B-Application
,	O
and	O
FreeBSD	B-Operating_System
.	O
</s>
<s>
The	O
FreeSWITCH	B-Language
project	O
was	O
initially	O
announced	O
in	O
January	O
2006	O
and	O
the	O
first	O
version	O
was	O
officially	O
released	O
in	O
May	O
2008	O
.	O
</s>
<s>
The	O
subsequent	O
versions	O
,	O
1.2	O
,	O
1.3	O
and	O
1.4	O
,	O
were	O
released	O
in	O
2012	O
and	O
2014	O
supporting	O
SIP	O
over	O
Websocket	O
and	O
WebRTC	B-Protocol
.	O
</s>
<s>
In	O
2018	O
,	O
SignalWire	O
Inc	O
.	O
was	O
founded	O
to	O
provide	O
commercial	O
cloud	O
telecommunication	O
services	O
utilizing	O
an	O
elastic	O
FreeSWITCH	B-Language
core	O
,	O
and	O
provide	O
a	O
permanent	O
commercial	O
sponsor	O
for	O
the	O
open	O
source	O
project	O
that	O
was	O
controlled	O
by	O
the	O
founders	O
of	O
FreeSWITCH	B-Language
.	O
</s>
<s>
It	O
then	O
acquired	O
FreeSWITCH	B-Language
Solutions	O
.	O
</s>
<s>
FreeSWITCH	B-Language
runs	O
on	O
Linux	B-Application
,	O
Windows	B-Application
,	O
macOS	B-Application
,	O
and	O
FreeBSD	B-Operating_System
.	O
</s>
<s>
It	O
is	O
distributed	O
under	O
the	O
Mozilla	B-License
Public	I-License
License	I-License
(	O
MPL	O
)	O
.	O
</s>
<s>
According	O
to	O
the	O
original	O
designer	O
,	O
Anthony	O
Minessale	O
,	O
FreeSWITCH	B-Language
is	O
intended	O
to	O
be	O
a	O
softswitch	B-Device
that	O
is	O
built	O
around	O
a	O
core	O
library	O
,	O
driven	O
by	O
a	O
state	O
machine	O
,	O
which	O
can	O
be	O
embedded	B-Architecture
into	O
other	O
projects	O
.	O
</s>
<s>
FreeSWITCH	B-Language
provides	O
a	O
scalable	O
system	O
around	O
a	O
stable	O
switching	O
core	O
,	O
and	O
a	O
robust	O
interface	O
for	O
developers	O
to	O
add	O
to	O
and	O
control	O
the	O
system	O
.	O
</s>
<s>
FreeSWITCH	B-Language
is	O
used	O
to	O
build	O
private	B-Device
branch	I-Device
exchange	I-Device
(	O
PBX	O
)	O
,	O
IVR	O
services	O
,	O
videoconferencing	O
with	O
chat	O
and	O
screen	O
sharing	O
,	O
wholesale	O
least-cost	O
routing	O
,	O
Session	B-Protocol
Border	I-Protocol
Controller	I-Protocol
(	O
SBC	O
)	O
and	O
embedded	B-Architecture
communication	O
appliances	O
.	O
</s>
<s>
It	O
also	O
has	O
support	O
for	O
encryption	O
,	O
ZRTP	B-Protocol
,	O
DTLS	B-General_Concept
.	O
</s>
<s>
Projects	O
such	O
as	O
BigBlueButton	B-Protocol
is	O
built	O
on	O
top	O
of	O
FreeSWITCH	B-Language
and	O
FusionPBX	O
is	O
an	O
add-on	O
to	O
FreeSWITCH	B-Language
that	O
provides	O
a	O
web	O
management	O
interface	O
.	O
</s>
<s>
In	O
June	O
2007	O
,	O
FreeSWITCH	B-Language
was	O
selected	O
by	O
Truphone	B-Language
for	O
use	O
,	O
and	O
in	O
August	O
2007	O
,	O
Gaboogie	O
announced	O
that	O
it	O
selected	O
FreeSWITCH	B-Language
as	O
its	O
conferencing	O
platform	O
.	O
</s>
