Telex MS-2002 User Manual

If you use VOX, you do not have to insure the microphone key is turned on whenever you want to talk. 

To activate VOX, do the following:

Verify the Headset and Panel Mic keys are off.

If you are using a headset, tap the Headset key twice to turn on headset VOX.
OR
If you are using a panel microphone, tap the Panel Mic key twice to turn on panel mic VOX. 
Whichever key you tap, it glows orange when the microphone is off and flickers or turns green when the microphone 
is off and  flickers and turns green when the microphone turns on.

REFERENCE: For more information on VOX adjustment, see “Voice-Activated Microphone (VOX) Setup”, page 14.

Normally, incoming calls are indicated by red-flashing Call keys. 

To enable incoming call beep, do the following:

NOTE: Ensure this feature has been activated via internal switches (page 11).

Press and hold the Mic Kill Key for about 2 seconds, then release it.
It should now be lit green to indicate the intercom station is in programming mode.

Tap either Call key on the MS-2002 to turn the beep feature on or off.

NOTE: It does not matter which one you tap, since this feature affects both channels.

Tap the Mic Kill key to return to normal operation.