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Polycom RMX 2000 Administrator’s Guide
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When cascading two conferences, the video layout displayed in the 
cascaded conference is determined by the selected layout in each of the 
two conferences. Each of the two conferences will inherit the video layout 
of the other conference in one of their windows.
In order to avoid cluttering in the cascaded window, it is advised to select 
appropriate video layouts in each conference before cascading them.
Figure 2-4
Video Layouts in Cascaded Conferences
The following features are not supported by the cascaded link and 
therefore are not supported in the combined conference:
DTMF codes are enabled in cascaded conference, but only in their 
local conference. The operations executed via DTMF codes are not 
forwarded between linked conferences.
FECC (Far End Camera Control will only apply to conferences 
running in their local MCU).
Without 
Cascade
Conference A
Conference B
During 
Cascading
Video layout of Conf. B in 
window of Conf. A
Video layout of Conf. A in 
window of Conf. B