30
 Select MENU > PA > CALIBRATION.
 AUTO is the default setting and is recommended in most cases. The gure shown in 
brackets is the measured calibration value.
  Select different levels and compare the audio quality to achieve your preferred setting. 
 NB. You must ask the person you are calling to assess the effect of the adjustments 
you make.
SYSTEM
The system menu can be used for manual restarts and resets.
Restarting the phone programme
This restarts the telephone application, which takes less than 30 seconds. 
 Select MENU > SYSTEM > RESTART ( 7,1).
  Conrm that you really want to restart by pressing OK again, or cancel the restart by 
pressing C.
Restarting the phone
This restarts the phone, which takes about two minutes. 
 Select MENU > SYSTEM > REBOOT ( 7, 2).
  Conrm that you really want to restart by pressing OK again, or cancel the restart by 
pressing C.
Restore to factory settings
This option fully restores the OmniTouch 4135 IP to factory settings. All settings are 
deleted, including PIN codes and registered accounts. Alternatively, a PIN code is 
required for Admin. 
 Select MENU > SYSTEM > FACTORY RESET ( 7, 3).
  Enter the PIN code for Admin and press OK.
  Conrm that you really want to restart by pressing OK again, or cancel the restart by 
pressing C.
SETTINGS