<s>
Xabber	B-Protocol
(	O
from	O
XMPP	B-Protocol
and	O
Jabber	B-Protocol
)	O
is	O
a	O
XMPP	B-Protocol
client	O
for	O
the	O
Android	B-Application
Operating	I-Application
System	I-Application
.	O
</s>
<s>
It	O
is	O
developed	O
as	O
an	O
open	O
source	O
Project	O
on	O
GitHub	B-Application
and	O
is	O
licensed	O
under	O
the	O
GNU	B-License
GPL	I-License
v.3	O
license	O
.	O
</s>
<s>
The	O
original	O
developers	O
are	O
from	O
a	O
software	O
company	O
called	O
Redsolution	O
,	O
Inc	O
.	O
Xabber	B-Protocol
is	O
available	O
on	O
the	O
Android	B-Application
Play	O
Store	O
and	O
on	O
F-Droid	B-Application
.	O
</s>
<s>
Xabber	B-Protocol
supports	O
Off-the-Record	B-Protocol
Messaging	I-Protocol
to	O
provide	O
encrypted	O
communication	O
.	O
</s>
<s>
Until	O
30	O
January	O
2013	O
was	O
closed	O
source	O
,	O
but	O
was	O
then	O
published	O
on	O
GitHub	B-Application
as	O
a	O
decision	O
by	O
the	O
development	O
team	O
.	O
</s>
<s>
Because	O
Xabber	B-Protocol
implements	O
XMPP	B-Protocol
Protocols	I-Protocol
,	O
it	O
is	O
compatible	O
with	O
any	O
XMPP	B-Protocol
Server	O
.	O
</s>
<s>
Xabber	B-Protocol
offers	O
no	O
server	O
infrastructure	O
of	O
its	O
own	O
,	O
but	O
it	O
has	O
a	O
few	O
popular	O
services	O
pre-configured	O
.	O
</s>
<s>
The	O
developers	O
confirmed	O
compatibility	O
with	O
Ejabberd	B-Protocol
,	O
Prosody	B-Language
and	O
Openfire	B-Language
.	O
</s>
<s>
The	O
application	O
has	O
integration	O
with	O
the	O
systemwide	O
Android	B-Application
Contacts	O
.	O
</s>
<s>
Xabber	B-Protocol
uses	O
Off	B-Protocol
the	I-Protocol
Record	I-Protocol
Messaging	I-Protocol
in	O
combination	O
TLS	O
to	O
provide	O
strong	O
Security	O
(	O
Perfect	O
Forward	O
Secrecy	O
)	O
.	O
</s>
<s>
Since	O
30	O
September	O
2013	O
Xabber	B-Protocol
uses	O
Orbot	B-Language
as	O
an	O
additional	O
Layer	O
of	O
Protection	O
.	O
</s>
<s>
Orbot	B-Language
is	O
used	O
to	O
access	O
the	O
Tor	B-Application
Network	I-Application
to	O
obfuscate	O
the	O
connections	O
between	O
sender	O
and	O
recipient	O
.	O
</s>
<s>
When	O
used	O
in	O
conjunction	O
with	O
a	O
privately	O
owned	O
XMPP	B-Protocol
Server	O
the	O
system	O
is	O
less	O
insecure	O
.	O
</s>
<s>
Xabber	B-Protocol
supports	O
the	O
following	O
XMPP	B-Protocol
protocol	I-Protocol
Extensions	O
:	O
</s>
<s>
XEP	O
(	O
XMPP	B-Protocol
Extension	O
Protocols	O
)	O
are	O
standardized	O
extensions	O
for	O
XMPP	B-Protocol
.	O
</s>
