<s>
3G-324M	B-Application
is	O
the	O
3GPP	O
umbrella	O
protocol	O
for	O
video	B-Application
telephony	I-Application
in	O
3G	B-Architecture
mobile	I-Architecture
networks	O
.	O
</s>
<s>
communication	O
over	O
Circuit	B-Protocol
Switched	I-Protocol
(	O
CS	O
)	O
networks	O
and	O
has	O
been	O
adopted	O
by	O
the	O
3GPP	O
.	O
</s>
<s>
3G-324M	B-Application
is	O
based	O
on	O
the	O
ITU-T	O
H.324	O
specification	O
for	O
multimedia	O
conferencing	O
over	O
Circuit	B-Protocol
switched	I-Protocol
networks	I-Protocol
.	O
</s>
<s>
3G-324M	B-Application
is	O
composed	O
of	O
the	O
following	O
sub-protocols	O
:	O
</s>
<s>
The	O
3G-324M	B-Application
specification	O
using	O
the	O
Circuit	B-Protocol
switched	I-Protocol
network	I-Protocol
allows	O
delay	O
sensitive	O
conversational	O
multimedia	O
services	O
such	O
as	O
:	O
</s>
<s>
3G-324M	B-Application
is	O
agnostic	O
to	O
the	O
actual	O
Circuit	B-Protocol
switched	I-Protocol
network	I-Protocol
that	O
uses	O
it	O
.	O
</s>
<s>
It	O
can	O
run	O
as	O
easily	O
over	O
UMTS	B-Protocol
as	O
well	O
as	O
TD-SCDMA	O
networks	O
.	O
</s>
<s>
3G-324M	B-Application
operating	O
over	O
a	O
circuit	B-Protocol
switched	I-Protocol
channel	O
between	O
two	O
communication	O
peers	O
guarantees	O
the	O
fixed-delay	O
quality	O
of	O
service	O
for	O
multimedia	O
communications	O
.	O
</s>
<s>
Combining	O
Circuit	B-Protocol
switched	I-Protocol
3G-324M	B-Application
services	O
with	O
packet-based	O
SIP	B-Application
services	O
such	O
as	O
presence	O
can	O
leverage	O
the	O
strength	O
of	O
both	O
networks	O
to	O
enable	O
new	O
types	O
of	O
differentiated	O
and	O
innovative	O
mobile	O
3G	B-Architecture
services	O
.	O
</s>
