Go to Intercom->Basic, to configure basic call setting.
Key Switch: To enable or disable the password unlock , it is
much useful for some special occasion which do not allow to
use password.
Send Key: Limit to use the # key. It will prevent someone to
enter the LCD setting illegally.
Key Value: The public key for the all occupants in a building.
No Answer Action: For sending the notification to specified
email if the call is not answered.