Polycom SoundStructure C16 Design Manual page 258

In this event, every time the PTT button is closed, the clink_mute parameter is toggled.
To mute the microphones based on clink_mute, another event is required to 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
toggles and any change in the clink_mute parameter is mapped directly to the mute state of "Mics" causing
all microphones in the "Mics" group to be muted.
Polycom, Inc. 258