Polycom MX392 - Manual (Page 9)

Now, 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 switch goes Active Low (0V DC), the Vortex Device will unmute
Input 1.
Now, 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 switch goes Active High (+ 5V DC), the Vortex Device will mute
Input 1.
Do not assign any command to the H ELD C OMMAND column.
If you are successful, you should see this on the screen:
9