<s>
Kamailio	B-Protocol
,	O
formerly	O
OpenSER	O
(	O
and	O
sharing	O
some	O
common	O
history	O
with	O
SIP	B-Protocol
Express	I-Protocol
Router	I-Protocol
(	O
SER	O
)	O
)	O
,	O
is	O
a	O
SIP	B-Application
server	O
licensed	O
under	O
the	O
GPL-2.0-or-later	B-License
license	O
.	O
</s>
<s>
It	O
can	O
be	O
configured	O
to	O
act	O
as	O
a	O
SIP	B-Application
registrar	O
,	O
proxy	O
or	O
redirect	O
server	O
,	O
and	O
features	O
presence	O
support	O
,	O
RADIUS/syslog	O
accounting	O
and	O
authorization	O
,	O
XML-RPC	B-Protocol
and	O
JSON-RPC-based	O
remote	O
control	O
,	O
SQL	B-Language
and	O
NoSQL	B-General_Concept
backends	O
,	O
IMS/VoLTE	O
extensions	O
and	O
others	O
.	O
</s>
<s>
Kamailio	B-Protocol
is	O
a	O
Hawaiian	O
word	O
.	O
</s>
<s>
Kamailio	B-Protocol
is	O
written	O
in	O
pure	O
C	B-Language
with	O
architecture-specific	O
optimizations	O
;	O
it	O
can	O
be	O
configured	O
for	O
many	O
scenarios	O
including	O
small-office	O
use	O
,	O
enterprise	O
PBX	B-Device
replacements	O
and	O
carrier	O
services	O
—	O
it	O
is	O
SIP	B-Application
signaling	O
server	O
—	O
a	O
proxy	O
—	O
aiming	O
to	O
be	O
used	O
for	O
large	O
real-time	O
communication	O
services	O
.	O
</s>
<s>
Kamailio	B-Protocol
is	O
used	O
by	O
large	O
Internet	O
Service	O
Providers	O
to	O
provide	O
public	O
telephony	O
service	O
.	O
</s>
<s>
OpenSIPS	O
,	O
a	O
fork	O
of	O
SER	O
which	O
has	O
diverged	O
—	O
deciding	O
to	O
"	O
go	O
their	O
own	O
way	O
"	O
from	O
the	O
SER	O
and	O
OpenSER	O
codebases	O
—	O
is	O
a	O
free	B-Application
software	I-Application
implementation	O
of	O
SIP	B-Application
for	O
voice	B-Application
over	I-Application
IP	I-Application
(	O
VoIP	B-Application
)	O
that	O
can	O
be	O
used	O
to	O
handle	O
voice	O
,	O
text	O
and	O
video	O
communication	O
.	O
</s>
<s>
The	O
software	O
was	O
recognized	O
by	O
Google	O
in	O
2017	O
with	O
their	O
Open	B-Application
Source	I-Application
Peer	O
Bonus	O
award	O
.	O
</s>
<s>
Kamailio	B-Protocol
's	O
roots	O
go	O
back	O
to	O
2001	O
,	O
when	O
the	O
first	O
line	O
of	O
SIP	B-Protocol
Express	I-Protocol
Router	I-Protocol
(	O
SER	O
)	O
was	O
written	O
;	O
at	O
the	O
time	O
,	O
the	O
working	O
group	O
published	O
results	O
at	O
—	O
in	O
September	O
2002	O
the	O
code	O
itself	O
was	O
published	O
under	O
the	O
GPL	B-License
.	O
</s>
<s>
The	O
first	O
fork	O
of	O
SER	O
came	O
in	O
2005	O
—	O
OpenSER	O
—	O
which	O
would	O
later	O
merge	O
back	O
into	O
the	O
code	O
that	O
would	O
become	O
Kamailio	B-Protocol
.	O
</s>
<s>
The	O
codebases	O
of	O
SER	O
and	O
OpenSER	O
(	O
by	O
then	O
known	O
as	O
Kamailio	B-Protocol
)	O
converged	O
in	O
December	O
2012	O
,	O
and	O
it	O
was	O
decided	O
to	O
continue	O
to	O
use	O
Kamailio	B-Protocol
as	O
the	O
main	O
name	O
of	O
the	O
project	O
,	O
which	O
remains	O
open	B-Application
source	I-Application
.	O
</s>
<s>
Two	O
of	O
the	O
five	O
SER	O
core	O
developers	O
and	O
one	O
main	O
contributor	O
start	O
a	O
new	O
free	B-Application
and	I-Application
open	I-Application
source	I-Application
software	I-Application
project	O
named	O
OpenSER	O
.	O
</s>
<s>
The	O
company	O
IPtel.org	O
is	O
bought	O
by	O
TEKELEC	O
,	O
and	O
is	O
responsible	O
for	O
the	O
TEKELEC	O
session	O
router	O
and	O
CSCF	O
.	O
</s>
<s>
FOKUS	O
and	O
the	O
Kamailio	B-Protocol
community	O
organize	O
the	O
first	O
iteration	O
of	O
the	O
annual	O
'	O
Kamailio	B-Protocol
World	O
 '	O
conference	O
in	O
Berlin	O
,	O
Germany	O
.	O
</s>
