Polycom V500 Release Note page 26

Release Notes
V500 and VSX systems, version 8.5
Feature Limitation
Multipoint On a VSX system in a multipoint chair control call, all far site
systems see frozen video if you disconnect the endpoint that
is the broadcaster. To restore video, select one of the
remaining endpoints as the broadcaster.
When a conference has a meeting password set and another
system dials in, the video from the system dialing in can be
viewed by the conference sites even before it enters the
password. The conference video and audio is not available at
the system dialing in until it actually joins the conference.
Only a VSX 8000 system as MCU supports H.264 in
multipoint calls, and it is limited to 3 video + 1 local
conference site. If the conference size increases, the
protocol negotiated is H.263. Once it drops back to a 4-way
call or lower, H.264 is not re-negotiated.
Discussion mode is turned off in cascaded MCU calls.
Things to note about multipoint calling:
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Network When a system behind a non-H.323 compatible NAT makes
a call to an endpoint outside the NAT, the far site is unable to
control the camera of the system behind the NAT.
Dual Monitor Emulation is disabled in multipoint calls on
VSX 3000, VSX 7000, VSX7000s, and VSX7000e
systems. These systems can support AES Encryption or
StereoSurround™, but not both. If AES Encryption is
enabled, the system automatically turns off
StereoSurround.
In multipoint calls on VSX 8000 systems, 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.
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