<s>
BT	B-Protocol
Fusion	I-Protocol
was	O
a	O
telecommunications	O
product	O
available	O
from	O
BT	O
Group	O
in	O
the	O
United	O
Kingdom	O
until	O
1	O
April	O
2009	O
when	O
it	O
was	O
withdrawn	O
.	O
</s>
<s>
It	O
"	O
fused	O
"	O
together	O
mobile	O
telephony	O
and	O
,	O
from	O
the	O
user	O
's	O
point	O
of	O
view	O
,	O
conventional	O
landline	B-Application
telephony	I-Application
.	O
</s>
<s>
In	O
fact	O
,	O
the	O
fixed	O
portion	O
of	O
the	O
link	O
was	O
provided	O
by	O
a	O
Voice	B-Application
over	I-Application
IP	I-Application
implementation	O
using	O
the	O
domestic	O
ADSL	O
service	O
.	O
</s>
<s>
The	O
BT	B-Protocol
Fusion	I-Protocol
service	O
was	O
compatible	O
with	O
the	O
BT	B-Device
Smart	I-Device
Hub	I-Device
.	O
</s>
<s>
The	O
same	O
phone	O
was	O
used	O
(	O
a	O
modified	O
version	O
of	O
the	O
Motorola	B-Application
RAZR	I-Application
or	O
Motorola	O
V560	O
)	O
,	O
but	O
if	O
the	O
phone	O
was	O
within	O
range	O
of	O
a	O
special	O
base	O
station	O
installed	O
in	O
the	O
user	O
's	O
home	O
or	O
office	O
then	O
incoming	O
and	O
outgoing	O
calls	O
will	O
be	O
routed	O
through	O
that	O
base	O
station	O
instead	O
of	O
the	O
mobile	O
network	O
.	O
</s>
<s>
This	O
link	O
between	O
the	O
phone	O
and	O
base	O
station	O
was	O
carried	O
over	O
Bluetooth	B-Protocol
(	O
BT	B-Protocol
Fusion	I-Protocol
was	O
latterly	O
available	O
using	O
Wifi	O
technology	O
,	O
thus	O
allowing	O
discounts	O
not	O
only	O
at	O
home	O
but	O
over	O
BT	O
Openzone	O
WiFi	O
hotspots	O
)	O
.	O
</s>
<s>
BT	B-Protocol
Fusion	I-Protocol
was	O
an	O
example	O
of	O
one	O
type	O
of	O
telecommunication	O
convergence	O
.	O
</s>
<s>
Voice	B-Application
over	I-Application
IP	I-Application
protocols	O
were	O
used	O
to	O
transmit	O
the	O
call	O
,	O
but	O
this	O
was	O
intended	O
to	O
remain	O
largely	O
unnoticed	O
from	O
the	O
user	O
's	O
point	O
of	O
view	O
.	O
</s>
<s>
In	O
particular	O
,	O
the	O
charges	O
for	O
calls	O
made	O
over	O
the	O
"	O
home	O
"	O
part	O
of	O
a	O
BT	B-Protocol
Fusion	I-Protocol
system	O
were	O
essentially	O
the	O
same	O
as	O
landline	B-Application
call	O
charges	O
.	O
</s>
<s>
In	O
particular	O
,	O
they	O
pointed	O
to	O
free	O
or	O
cheaper-than-landline	O
IP	O
phone	O
systems	O
like	O
Skype	B-Application
.	O
</s>
