<s>
TeamTalk	B-Protocol
is	O
a	O
conferencing	B-Protocol
system	I-Protocol
which	O
people	O
use	O
to	O
communicate	O
on	O
the	O
Internet	O
using	O
VoIP	B-Application
and	O
video	B-Application
streaming	I-Application
.	O
</s>
<s>
The	O
TeamTalk	B-Protocol
conferencing	B-Protocol
system	I-Protocol
consists	O
of	O
a	O
server	O
and	O
client	O
application	O
.	O
</s>
<s>
Users	O
are	O
required	O
to	O
set	O
up	O
their	O
own	O
TeamTalk	B-Protocol
server	O
before	O
they	O
can	O
use	O
the	O
system	O
.	O
</s>
<s>
The	O
TeamTalk	B-Protocol
server	O
is	O
available	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
Windows	O
and	O
the	O
widely	O
used	O
Linux	B-Application
distributions	O
CentOS	O
,	O
Debian	O
and	O
Raspbian	B-Application
.	O
</s>
<s>
The	O
TeamTalk	B-Protocol
client	O
application	O
supports	O
the	O
same	O
platforms	O
as	O
the	O
server	O
and	O
additionally	O
supports	O
mobile	O
platforms	O
iOS	B-Application
and	O
Android	B-Application
.	O
</s>
<s>
For	O
voice	O
encoding	O
TeamTalk	B-Protocol
uses	O
Opus	B-Algorithm
and	O
Speex	B-Application
audio	O
codec	O
.	O
</s>
<s>
Video	B-Application
streams	I-Application
are	O
encoded	O
using	O
VP8	B-Algorithm
video	O
codec	O
.	O
</s>
<s>
The	O
majority	O
of	O
TeamTalk	B-Protocol
users	O
are	O
visually	O
impaired	O
who	O
use	O
a	O
screen	O
reader	O
for	O
navigating	O
in	O
the	O
user	O
interface	O
.	O
</s>
<s>
To	O
be	O
as	O
accessible	O
as	O
possible	O
the	O
TeamTalk	B-Protocol
client	O
applications	O
strive	O
to	O
only	O
use	O
standard	O
window	O
controls	O
which	O
can	O
be	O
detected	O
by	O
the	O
screen	O
reader	O
.	O
</s>
<s>
The	O
TeamTalk	B-Protocol
client	O
applications	O
are	O
being	O
developed	O
on	O
the	O
GitHub	B-Application
project	O
TeamTalk5	O
.	O
</s>
<s>
The	O
TeamTalk	B-Protocol
server	O
is	O
proprietary	B-Application
and	O
its	O
source	O
code	O
is	O
therefore	O
not	O
available	O
publicly	O
.	O
</s>
<s>
TeamTalk	B-Protocol
is	O
a	O
freeware	B-License
application	O
and	O
is	O
available	O
for	O
download	O
on	O
popular	O
software	O
sites	O
.	O
</s>
<s>
Developers	O
wanting	O
to	O
write	O
applications	O
for	O
TeamTalk	B-Protocol
must	O
however	O
buy	O
a	O
license	O
.	O
</s>
