<s>
The	O
Session	B-Protocol
Announcement	I-Protocol
Protocol	I-Protocol
(	O
SAP	O
)	O
is	O
an	O
experimental	O
protocol	O
for	O
advertising	O
multicast	O
session	O
information	O
.	O
</s>
<s>
SAP	O
typically	O
uses	O
Session	B-Language
Description	I-Language
Protocol	I-Language
(	O
SDP	O
)	O
as	O
the	O
format	O
for	O
Real-time	B-Protocol
Transport	I-Protocol
Protocol	I-Protocol
(	O
RTP	O
)	O
session	O
descriptions	O
.	O
</s>
<s>
Announcement	O
data	O
is	O
sent	O
using	O
IP	B-Protocol
multicast	I-Protocol
and	O
the	O
User	B-Protocol
Datagram	I-Protocol
Protocol	I-Protocol
(	O
UDP	O
)	O
.	O
</s>
<s>
Under	O
SAP	O
,	O
senders	O
periodically	O
transmit	O
SDP	O
descriptions	O
to	O
a	O
well-known	O
multicast	B-Protocol
address	I-Protocol
and	O
port	B-Protocol
number	I-Protocol
(	O
9875	O
)	O
.	O
</s>
<s>
The	O
message	O
body	O
may	O
optionally	O
be	O
compressed	B-Algorithm
using	O
the	O
zlib	B-Language
format	O
as	O
defined	O
in	O
RFC	O
1950	O
.	O
</s>
<s>
VLC	B-Application
media	I-Application
player	I-Application
monitors	O
SAP	O
announcements	O
and	O
presents	O
the	O
user	O
a	O
list	O
of	O
available	O
streams	O
.	O
</s>
