<s>
UNIStim	B-Protocol
(	O
or	O
Unified	O
Networks	O
IP	O
Stimulus	O
)	O
is	O
a	O
deprecated	O
Telecommunications	O
protocol	O
developed	O
by	O
Nortel	O
(	O
now	O
acquired	O
by	O
Avaya	O
)	O
for	O
IP	O
Phone	O
(	O
terminals	O
and	O
soft	O
phones	O
)	O
and	O
IP	O
PBX	B-Device
communications	O
.	O
</s>
<s>
Most	O
manufacturers	O
of	O
IP	O
PBX	B-Device
equipment	O
(	O
Aastra	O
,	O
Alcatel	O
,	O
Avaya	O
...	O
)	O
have	O
followed	O
the	O
same	O
path	O
,	O
developing	O
their	O
own	O
proprietary	O
protocols	O
.	O
</s>
<s>
These	O
protocols	O
are	O
being	O
gradually	O
replaced	O
or	O
complemented	O
by	O
standardized	O
protocols	O
,	O
including	O
H.323	B-Protocol
,	O
especially	O
SIP	B-Application
.	O
</s>
<s>
In	O
this	O
sense	O
,	O
the	O
stimulus	O
protocols	O
differ	O
from	O
functional	O
protocols	O
(	O
such	O
as	O
SIP	B-Application
or	O
H.323	B-Protocol
)	O
that	O
impose	O
on	O
the	O
one	O
hand	O
that	O
the	O
service	O
is	O
defined	O
in	O
the	O
standard	O
and	O
that	O
the	O
terminal	O
loads	O
specific	O
logic	O
corresponding	O
to	O
the	O
service	O
in	O
question	O
.	O
</s>
<s>
Nortel	O
has	O
been	O
very	O
active	O
in	O
the	O
standardization	O
effort	O
of	O
these	O
protocols	O
within	O
the	O
IETF	O
,	O
drawing	O
on	O
its	O
work	O
with	O
pre-standard	O
UNIStim	B-Protocol
and	O
already	O
developed	O
work	O
on	O
the	O
Nortel	O
IP	O
PBX	B-Device
systems	O
and	O
its	O
IP	O
Centrex	O
platforms	O
from	O
1996	O
.	O
</s>
<s>
The	O
UNIStim	B-Protocol
protocol	O
is	O
implemented	O
on	O
Avaya	O
IP	O
PBX	B-Device
systems	O
and	O
licensed	O
by	O
third-party	O
suppliers	O
→	O
History	O
See	O
for	O
example	O
the	O
release	O
of	O
the	O
company	O
Spectralink	O
,	O
</s>
<s>
Details	O
on	O
the	O
implementation	O
of	O
the	O
protocol	O
UNISTIM	B-Protocol
are	O
available	O
in	O
the	O
document	O
"	O
Telephony	O
and	O
Data	O
Network	O
Services	O
at	O
a	O
Telephone	O
"	O
,	O
filed	O
in	O
the	O
United	O
States	O
Patent	O
No	O
.	O
</s>
<s>
The	O
Secure	O
UNIStim	B-Protocol
protocol	O
is	O
implemented	O
on	O
the	O
AS5300	B-Protocol
or	O
the	O
CS2100	O
enables	O
encryption	O
of	O
the	O
UNIStim	B-Protocol
protocol	O
with	O
the	O
use	O
of	O
a	O
SMC	O
2450	O
.	O
</s>
