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  To add a local area code to all numbers dialed over a trunk:
      - Login to the system administration
      - Navigate to 'Settings->Servers'
      - Check that 'Area Code' is set (e.g. 818)
      - Navigate to 'Trunks'
      - Edit preferred trunk
      - Set 'Local Area Code'='Yes'
      - Click on 'Save'
      - Now, if you dial '450-1675', the system will add '818' in front and dial '818-450-1675'
    
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