<s>
JsSIP	B-Language
is	O
a	O
library	O
for	O
the	O
programming	O
language	O
JavaScript	B-Language
.	O
</s>
<s>
It	O
takes	O
advantage	O
of	O
SIP	B-Application
and	O
WebRTC	B-Protocol
to	O
provide	O
a	O
fully	O
featured	O
SIP	B-Application
endpoint	O
in	O
any	O
website	O
.	O
</s>
<s>
JsSIP	B-Language
allows	O
any	O
website	O
to	O
get	O
real-time	O
communication	O
features	O
using	O
audio	O
and	O
video	O
.	O
</s>
<s>
It	O
makes	O
it	O
possible	O
to	O
build	O
SIP	B-Application
user	O
agents	O
that	O
send	O
and	O
receive	O
audio	O
and	O
video	O
calls	O
as	O
well	O
as	O
and	O
text	O
messages	O
.	O
</s>
<s>
JsSIP	B-Language
implements	O
the	O
following	O
SIP	B-Application
specifications	O
:	O
</s>
<s>
JsSIP	B-Language
uses	O
the	O
SIP	B-Application
over	O
WebSocket	B-Protocol
transport	O
for	O
sending	O
and	O
receiving	O
SIP	B-Application
requests	O
and	O
responses	O
,	O
and	O
thus	O
,	O
it	O
requires	O
a	O
SIP	B-Application
proxy/server	O
with	O
WebSocket	B-Protocol
support	O
.	O
</s>
<s>
Currently	O
the	O
following	O
SIP	B-Application
servers	O
have	O
been	O
tested	O
and	O
are	O
using	O
JsSIP	B-Language
as	O
the	O
basis	O
for	O
their	O
WebRTC	B-Protocol
Gateway	I-Protocol
functionality	O
:	O
</s>
<s>
At	O
the	O
media	O
plane	O
(	O
audio	O
calls	O
)	O
,	O
JsSIP	B-Language
version	O
0.2.0	O
works	O
with	O
Chrome	O
browser	O
from	O
version	O
24	O
.	O
</s>
<s>
At	O
the	O
signaling	O
plane	O
(	O
SIP	B-Application
protocol	O
)	O
,	O
JsSIP	B-Language
runs	O
in	O
any	O
.	O
</s>
<s>
JsSIP	B-Language
is	O
provided	O
as	O
open-source	B-Application
software	I-Application
under	O
the	O
MIT	B-License
license	I-License
.	O
</s>
