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Polycom RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide
H-48 Polycom, Inc.
• G711A/U or G722 – Set this flag value according to the hosting workstation capabilities.
If the MCU detects single core host during capabilities exchange it will assign a G.711 or
G.722 Audio algorithm according to the flag value.
Possible values: AUTO, G711A, G711U, G722
Default: G711A
Controlling Resource Allocations for Lync Clients Using the RTV Video
Protocol
The number of resources used by the system to connect a Lync client with RTV is
determined according to the conference line rate and the Maximum video resolution set in
the Conference Profile.
In versions 7.6 and earlier, when conferences are set to line rates above 600 kbps, the MCU
could allocate up to three video resources to Lync clients connecting using the RTV video
protocol.
From version 7.6.1, the system flag MAX_RTV_RESOLUTION enables you to override the
MCU resolution selection and limit it to a lower resolution. Resource usage can then be
minimized the 1 or 1.5 video resources per call instead of 3 resources, depending on the
selected resolution.
Possible flag values are: AUTO (default), QCIF, CIF, VGA or HD720.
For example, if the flag is set to VGA, conference line rate is 1024Kbps, and the Profile
Maximum Resolution is set to Auto, the system will limit the Lync RTV client to a resolution
of VGA instead of HD720p and will consume only 1.5 video resources instead of 3
resources.
When set to AUTO (default), the system uses the default resolution matrix based on the
conference line rate.
To change the default flag setting, add the MAX_RTV_RESOLUTION flag to the System
Configuration flags and set its value. For information, see .
The following table summarizes the MCU resources allocated to a Lync Client based on the
MAX_RTV_RESOLUTION flag setting, the connection line rate and the video resolution.
Table H-3 Selected video resolution based on flag setting and conference line rate and core
processor
Maximum
Resolution
Value
Line Rate
Selected Video Resolution Per Core Processor
Quad Dual Single
AUTO > 600 kbps HD720p 30fps VGA 30fps VGA 15fps
250 kbps - 600 kbps VGA 30fps VGA 30fps VGA 15fps
180 kbps - 249 kbps CIF CIF CIF
64 kbps - 179 kbps QCIF QCIF QCIF
HD720p > 600 kbps HD720p 30fps HD720p 13fps VGA 15fps
250 kbps - 600 kbps VGA 30fps VGA 30fps VGA 15fps
180 kbps - 249 kbps CIF CIF CIF
64 kbps - 179 kbps QCIF QCIF QCIF