The Telephone Line Robo Call Killer ends unwanted callers. When a call is placed to your home, your phone rings once. The device picks up and prompts the caller to enter a code, "Press 64". You can choose your own code or you can choose to have the device simply say "Enter your code", leaving only the ones who you told the code to able to pass the verification stage. If the caller enters the code correctly, the call continues and the device allows the caller to leave a message on the answering machine; at which point you (the user) can pickup the phone if you want to talk to the caller.
An advanced version of the device will keep the phones in the house from ringing until the caller has entered the correct code.
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