<s>
MySIPSwitch	B-Protocol
is	O
a	O
Voice	B-Application
over	I-Application
IP	I-Application
(	O
VoIP	B-Application
)	O
open-source	O
software	O
under	O
BSD	B-Operating_System
licence	I-Operating_System
and	O
a	O
free	O
service	O
.	O
</s>
<s>
MySIPSwitch	B-Protocol
is	O
an	O
experimental	O
stateful	O
SIP	B-Application
Proxy	O
server	O
sponsored	O
by	O
Blue	O
Face	O
to	O
allow	O
the	O
use	O
of	O
multiple	O
supplier	O
SIP	B-Application
accounts	O
from	O
a	O
single	O
SIP	B-Application
login	O
.	O
</s>
<s>
It	O
basically	O
means	O
that	O
you	O
can	O
use	O
many	O
SIP	B-Application
accounts	O
with	O
a	O
single	O
piece	O
of	O
hardware	O
(	O
IP	O
Phone	O
,	O
ATA	O
or	O
softphone	O
)	O
.	O
</s>
<s>
MySIPSwitch	B-Protocol
also	O
allows	O
the	O
handling	O
of	O
SIP	B-Application
phone	O
calls	O
from	O
web	O
browsers	O
:	O
hangup	O
,	O
transfer	O
,	O
forward	O
,	O
hold	O
and	O
resume	O
.	O
</s>
<s>
This	O
makes	O
it	O
possible	O
to	O
receive	O
a	O
call	O
without	O
the	O
need	O
for	O
a	O
VoIP	B-Application
device	O
at	O
all	O
.	O
</s>
<s>
MySIPSwitch	B-Protocol
has	O
a	O
user	O
discussion	O
forum	O
allowing	O
developers	O
to	O
improve	O
it	O
according	O
to	O
the	O
feedback	O
from	O
users	O
.	O
</s>
<s>
The	O
development	O
language	O
is	O
C#	B-Application
,	O
the	O
database	O
environment	O
is	O
PostgreSQL	B-Application
and	O
the	O
interface	O
is	O
a	O
website	O
.	O
</s>
