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CONNECTING A WIRELESS HEADSET
  Connect the headset to the Aux port on OmniTouch 4135 IP. 
The microphones from the OmniTouch 4135 IP and the wireless headset will work 
simultaneously and transmit the call to other participants in the phone conference. 
Please refer to the headset manual for further information. 
Turning off the internal speakers when using a headset
The internal speakers can be turned off temporarily if you wish to use the OmniTouch 
4135 IP as a personal telephone with a headset. 
  During a call, select MENU > HEADSET.
  Select YES when asked “SPEAKER OFF?”.
 The speakers come on automatically when the call is ended.
HEADSET AND PA INSTALLATION AND SETTINGS