Polycom MX392 - Manual (Page 24)

Next, right click in the A CTIVATED C OMMAND column for Logic Input 1 and select I NSERT , I NPUT , 1,
M UTE , O FF . Now, whenever the microphone is unmuted (Mute = False), the LED will illuminate on
the MX392.
Next, right click in the D EACTIVATED C OMMAND column for Logic Input 1 and select I NSERT , I NPUT , 1,
M UTE , O N . Now, whenever the microphone is muted (Mute = True), the LED will not illuminate on
the MX392.
Here is what the screen should look like when you are finished (assuming a Vortex EF2241):
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