Polycom® RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide
4-2
Polycom, Inc.
H.239 Protocol
The
H.239
protocol allows compliant endpoints to transmit and receive two simultaneous
video streams:
•
People video stream
– video is displayed in Continuous Presence conferences or Video
Switching conferencing mode or in Media Relay (SVC) conferencing Mode
•
Content video stream
– Video Switching mode for content sharing
By default, all conferences,
Entry Queue
s, and
Meeting Rooms
launched on the
RMX
have
H.239
capabilities.
To view
Content
, endpoints must use the same Bit Rate, Protocol, and Resolution. Endpoints
may not send
Content
while connecting to an
Entry Queue
.
Endpoints without
H.239
capability can connect to the video conference without
Content
.
Cascade links declare
H.239
capabilities and they are supported in
Star
and
MIH
cascading
topologies. For more details, see "
Cascading Conferences - H.239-enabled MIH Topology”
on
page
5-28
.
Content
Content
utilizes a different signaling protocol and is
Polycom’s
proprietary equivalent
of
H.239
.
Guidelines
•
All network environments are supported.
•
Conferences can include a mix of endpoints that support
H.239
or
Content
.
•
All endpoints will receive Content at the highest resolution common to all connected
endpoints.
•
SIP Content
is supported with
MPM+
and
MPMx
cards.
•
H.239
is supported in
MIH
,
Star
and
Basic Cascading
topologies.
•
Content
is supported in cascaded conferences but cannot be used as the protocol
for a cascade link.
•
If an endpoint supports both
H.239
and
Content
protocols,
H.239
is selected as
the preferred communications protocol.
•
H.263
Annex T
and
H.264
protocols are supported for
Content
transmission.
•
Content
is enabled by default. It can be disabled for all conferences and
endpoints by manually adding the
ENABLE_EPC
System Flag
to the
System
Configuration
and setting its value to
NO
(default setting is
YES
).
•
Endpoints that support
Content
(for example,
FX
endpoints) may require a
different signaling protocol. For these endpoints, manually add the
System Flag
CS_ENABLE_EPC
to the
System Configuration
and set its value to
YES
(default value is
NO
).
•
Content sharing is not supported in Microsoft ICE environment (BFCP protocol).
•
Video endpoints that do not support SIP Content (such as PVX), can receive Content on
the People channel if the conference is set to
Send Content to Legacy Endpoints
. For more
details see, "
Sending Content to Legacy Endpoints (AVC Only)”
on page
4-20
.
Summary of Contents for RealPresence 2000
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