FSR ML-116 - Manual (Page 33)

USING PRIORITY PAGE AS AN “ALL MUTE” FUNCTION:
Create a short from the “ALL CALL” and “PRIORITY” terminals to the “GND”
on the HTP card through the relay maintained NO contacts on the external
control system. system.
Without page audio input present on the MP card input terminals, the mike and
music audio will be muted for the duration of the relay closure.