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 Do not select the PA option unless a PA system is connected. This option turns off 
the internal microphone and internal speakers as default. 
On phone: MENU > SETTINGS > BASIC > AUX PORT (6,1,5).
PA SETTINGS
To match several types of situations and equipment, there are some settings available in 
the OmniTouch 4135 IP menu. 
Activating internal microphone and speakers
 These settings are not available via the web interface. 
 Select MENU > SETTINGS > BASIC > PA (6,1,6).
  Select INTERNAL MIC and press OK to switch between on (shaded box) and off. 
 To ensure maximum audio quality, do not use the internal microphone and external 
microphones connected via the PA box at the same time.
 Only the internal microphone is turned off. Any external microphones connected to 
the OmniTouch 4135 IP are still turned on.
  Select INTERNAL SPKR and press OK to switch between on (shaded box) and off. 
 To ensure maximum audio quality, do not use the internal speakers and external 
speakers connected via the PA box at the same time. 
Adjusting microphone volume from PA
  During a call, select MENU > PA > PA MONITOR.
  Adjust the microphone volume from the mixer so that the level on the display screen 
is around 10–12 when speaking in a normal tone.
HEADSET AND PA INSTALLATION AND SETTINGS