Polycom DOC2560C - Manual (Page 161)

Polycom RMX 1500/2000/4000 Getting Started Guide
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The following table summarizes the Video Layout options available
via Click&View.
Conference Control Using DTMF Codes
Participants and chairpersons can manage their connection to ongoing
conferences from their endpoints, using touch-tone signals (DTMF codes)
from their endpoints. Table 3-9 lists the DTMF Codes that can be used.
Chairpersons can also control an ongoing conference using DTMF codes.
Table 3-8 Video Layout Options
DTMF Code
Group
Default
Layout
Group Layout Options
1
2
3
4
5
6
7
8
9
0 / Revert to the previous conference layout.