Polycom SoundStructure C16 Design Manual page 257

Using Events, Logic, And IR
In this event, every time the PTT button is closed, the clink_mute parameter
will be toggled.
To mute the microphones based on clink_mute, another event is required that
will map clink_mute to the mute of the "Mics" group.
The Clink_mute to Mics Mute event take the clink_mute state of device 1 and
maps that value to the mute state of the Mics group. Now whenever the PTT
microphone button is pushed, the clink_mute parameter will toggle and any
change in the clink_mute parameter will be mapped directly to the mute state
of "Mics" causing all microphones in the "Mics" group to be muted.
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