Go in to the configuration menu to change the Intercom VOX sensitivity.
Tap the (+) Button or the (-) Button until you hear the voice prompt, “VOX sensitivity”. By tapping the Center Button, it will lead you to the level adjustment mode. If you enter the mode, you will hear a prompt stating the current VOX sensitivity level. You may adjust the VOX sensitivity level by tapping the (+) Button or the (-) Button. Level 5 is the highest sensitivity setting and 1 the lowest. After you have completed the setting, tap the Center Button to apply the changes.