Polycom V500 Release Note page 29

Release Notes
V500 and VSX systems, version 8.5
Feature Limitation
Single-Monitor Single-monitor VGA has the following limitations:
VGA
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Only the steel gray color scheme is supported.
The system switches from dual monitor emulation to
full-screen mode when sending or receiving content.
On systems other than a VSX 8000, the H.264 maximum
call speed is reduced to 512 kbps if stereo audio is
enabled with a VGA main monitor.
On VSX 5000, VSX7000s, and VSX7000e systems
configured for single-monitor VGA:
Dual Monitor Emulation is disabled in multipoint calls.
The system can support AES Encryption or
StereoSurround, but not both. If AES Encryption is
enabled, the system automatically turns off
StereoSurround.
In point-to-point calls, only one of the following features
is supported: Dual Monitor Emulation, StereoSurround,
or AES Encryption. If you have more than one of these
enabled, the system turns off all but one. The system
gives highest priority to AES Encryption, if it is enabled.
If AES Encryption is not enabled, the system gives
higher priority to Dual Monitor Emulation, and turns off
StereoSurround.
Dual Monitor Emulation is automatically disabled at call
rates greater than 512 kbps.
On VSX 8000 systems configured for single-monitor
VGA:
In multipoint calls, only one of the following features is
supported: Dual Monitor Emulation, StereoSurround, or
AES Encryption. If you have more than one of these
enabled, the system turns off all but one. The system
gives highest priority to AES Encryption, if it is enabled.
If AES Encryption is not enabled, the system gives
higher priority to Dual Monitor Emulation, and turns off
StereoSurround.
In VSX 8000 multipoint calls with two or more far sites,
Dual Monitor Emulation is not supported.
In VSX 8000 multipoint calls with three or more far sites,
Dual Monitor Emulation, StereoSurround, and AES
Encryption are not supported.
Dual Monitor Emulation is automatically disabled at call
rates greater than 1 Mbps.
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