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RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator’s Guide
Polycom®, Inc. 89
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H.264 High Profile Support in Video Switching Conferences
Beginning with Version 7.6, the H.264 High Profile video protocol is supported in Video Switching (VSW)
conferences.
Guidelines
● H.264 High Profile is supported in VSW conferences in H.323 and SIP networking environments only
● For H.264 High Profile-enabled VSW conferences, all endpoints connecting to the conference must
support High Profile and connect to the VSW conference at the exact line rate and exact resolution
defined for the conference. Endpoints that do not meet these requirements are connected as
Secondary (audio only).
● For H.264 Base Profile VSW conferences, both High Profile and Base Profile supporting endpoints
connect using the H.264 Base Profile.
Endpoints that do not support the exact conference line rate are disconnected.
Endpoints that do not support the exact video settings such as protocol and resolution defined for
the conference will be connected as Secondary (audio only).
Minimum Threshold Line Rate System Flags
The following table lists the System Flags that control the minimum line rate threshold for the various
resolutions available for High Profile-enabled VSW conferences.
These system flags must be manually added to the Setup menu > System Configuration before you can
update their values. For more information see the Modifying System Flags.
System Flags - Minimum Threshold Line Rates
Flag Name Minimum Threshold Line Rate (Kbps)
VSW_CIF_HP_THRESHOLD_BITRATE 64
VSW_SD_HP_THRESHOLD_BITRATE 128
VSW_HD720p30_HP_THRESHOLD_BITRATE 512
VSW_HD720p50-60_HP_THRESHOLD_BITRATE 832
VSW_HD1080p_HP_THRESHOLD_BITRATE 1024
VSW_HD1080p60_HP_THRESHOLD_BITRATE 1024
VSW_HD_1080p60_BL_THRESHOLD_BITRATE 1728