Polycom C12, C16, C8, SR12 - page 292

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
9 - 76
The first C12 is configured to be bus id 1 and the second is configured to be bus
id 2 by default assuming the OBAM out of the first device is connected to the
OBAM in on the second device.
Controlling The System
The system can be controlled in the same manner as the previous examples.
The microphones may be muted and unmuted with the following mute
commands.
set mute “Mics” 1