Smart Buzzer for Apartments and Commercial Buildings

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My friends always give me a hard time for missing the buzzer call when they come over to my apartment... so I built an app that automatically answers these calls and then presses 9 to unlock the door. Problem solved, except it also meant literally anyone who buzzed my unit would get in to the building, which is not exactly the most secure. So I made a "magic word" feature. Now when someone buzzes, the call is still answered automatically, but they will be asked to say the magic word be...