<s>
The	O
location	B-Protocol
information	I-Protocol
server	I-Protocol
,	O
or	O
LIS	O
is	O
a	O
network	B-Protocol
node	I-Protocol
originally	O
defined	O
in	O
the	O
National	O
Emergency	O
Number	O
Association	O
i2	O
network	B-Architecture
architecture	I-Architecture
that	O
addresses	O
the	O
intermediate	O
solution	O
for	O
providing	O
e911	O
service	O
for	O
users	O
of	O
VoIP	B-Application
telephony	I-Application
.	O
</s>
<s>
The	O
LIS	O
is	O
the	O
node	B-Protocol
that	O
determines	O
the	O
location	O
of	O
the	O
VoIP	B-Application
terminal	O
.	O
</s>
<s>
Beyond	O
the	O
NENA	O
architecture	O
and	O
VoIP	B-Application
,	O
the	O
LIS	O
is	O
capable	O
of	O
providing	O
location	O
information	O
to	O
any	O
IP	B-Protocol
device	O
within	O
its	O
served	O
access	O
network	O
.	O
</s>
<s>
Location	O
information	O
can	O
be	O
retrieved	O
directly	O
—	O
known	O
as	O
by	O
value	O
—	O
or	O
the	O
LIS	O
can	O
generate	O
a	O
temporary	O
URI	B-Protocol
that	O
can	O
be	O
used	O
to	O
provide	O
location	O
indirectly	O
—	O
known	O
as	O
a	O
location	O
URI	B-Protocol
.	O
</s>
<s>
The	O
location	O
information	O
provided	O
by	O
a	O
LIS	O
primarily	O
uses	O
the	O
GEOPRIV	O
format	O
(	O
RFC	O
4119	O
)	O
,	O
an	O
XML	B-Protocol
representation	O
based	O
on	O
the	O
presence	B-Protocol
format	O
defined	O
in	O
RFC	O
3863	O
.	O
</s>
