<s>
Phoner	O
and	O
PhonerLite	B-Application
are	O
softphone	B-Protocol
applications	O
for	O
Windows	B-Application
operating	I-Application
systems	I-Application
available	O
as	O
freeware	B-License
.	O
</s>
<s>
Phoner	O
is	O
a	O
multiprotocol	O
telephony	O
application	O
supporting	O
telephony	O
via	O
CAPI	B-Protocol
,	O
TAPI	B-Library
and	O
VoIP	B-Application
,	O
while	O
PhonerLite	B-Application
provides	O
a	O
specialized	O
and	O
optimized	O
user	B-Application
interface	I-Application
for	O
VoIP	B-Application
only	O
.	O
</s>
<s>
Beside	O
the	O
different	O
user	B-Application
interface	I-Application
focus	O
both	O
programs	O
share	O
the	O
same	O
code	O
base	O
.	O
</s>
<s>
Both	O
programs	O
use	O
the	O
Session	B-Application
Initiation	I-Application
Protocol	I-Application
for	O
VoIP	B-Application
call	I-Application
signalisation	O
.	O
</s>
<s>
Media	O
streams	O
are	O
transmitted	O
via	O
the	O
Real-time	B-Protocol
Transport	I-Protocol
Protocol	I-Protocol
which	O
may	O
be	O
encrypted	O
with	O
the	O
Secure	B-Protocol
Real-time	I-Protocol
Transport	I-Protocol
Protocol	I-Protocol
(	O
SRTP	O
)	O
and	O
the	O
ZRTP	B-Protocol
security	O
protocols	O
.	O
</s>
<s>
Phoner	O
provides	O
as	O
well	O
an	O
interface	O
for	O
configuring	O
and	O
using	O
all	O
supplementary	O
ISDN	B-Protocol
services	O
provided	O
via	O
CAPI	B-Protocol
and	O
thus	O
needs	O
an	O
ISDN	B-Protocol
terminal	O
adapter	O
hardware	O
installed	O
in	O
the	O
computer	O
.	O
</s>
<s>
Both	O
programs	O
support	O
IPv4	B-Protocol
and	O
IPv6	B-Protocol
connections	O
by	O
using	O
UDP	B-Protocol
,	O
TCP	B-Protocol
and	O
TLS	B-Protocol
.	O
</s>
