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RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator’s Guide
Polycom®, Inc. 147
Content Protocols
Two Content Protocols can be used for sharing content:
● H.263 (CP and mixed CP and SVC)
● H.264 (all conferencing modes)
H.264 offers higher quality content, but is not supported by legacy endpoints. Depending on the endpoints
capabilities, you can determine the content sharing experience by selecting the appropriate protocol and
system behavior from the Content Protocol list:
● H.263 & H.264 Auto Selection (AVC CP Only)
● H.263 (AVC CP Only)
● H.264 HD (AVC CP Only)
● H.264 Cascade and SVC Optimized (all conferences)
H.263 & H.264 Auto Selection (AVC CP Conferences)
This option should be selected when Content is to be shared using a mix of H.263-supporting and
H.264-supporting endpoints. (In versions up to and including 7.6, this is named Up to H.264.)
Bit rate allocation to the Content channel by the Collaboration Server is dynamic according to the
conference line rate and Content Setting selected for the conference.
If an endpoint that supports only H.263 for Content Sharing connects to a conference with Content Protocol
set to H.263 & H.264 Auto Selection:
● Content is shared using H.263 even if H.264-supporting endpoints are connected.
● Content is shared using H.264 if all connected endpoints have H.264 capability.
● If the first endpoint to connect to the conference only supports H.263, the H.263 protocol is used for
Content for all conference participants.
● If Content is already being shared using the H.264 protocol when a H.263 endpoint connects, Content
sharing is stopped and must be manually restarted using H.263 (i.e. the endpoint using H.263
Content Protocol must connect first), for all participants to receive content. If the H.263 endpoint
disconnects, Content sharing must be manually stopped and restarted and will automatically upgrade
to the H.264 protocol.
● Endpoints that do not have at least H.263 capability can connect to the conference but cannot share
Content.
● This option is not available in SVC Conferencing Mode and CP and SVC Conferencing Mode
(applicable to AVC endpoints only).
H.263 (AVC CP Conferences)
Select this option when most of the endpoints support H.263 and some endpoints support H.264. In such a
case, all endpoints will share content using the H.263 protocol, and this protocol will not change throughout
the conference (fixed mode).
Bit rate allocation to the Content channel by the Collaboration Server is dynamic according to the
conference line rate and Content Settings selected for the conference. For more information see Content
Sharing Parameters in Content Highest Common (Content Video Switching) Mode.
This option is not available in SVC Conferencing Mode and CP and SVC Conferencing Mode.