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The ABB Telephone Gateway allows you to answer and make calls from/to outdoor stations in your ABB Door Entry System through a landline telephone, or even a mobile phone when used in conjunction with the IP Gateway (sold separately). This turns your phone into an audio indoor station! You can also control outputs, such as unlocking a door or switching on a light, through the telephone's keypad. It works by dialing your phone number, and routing the system call to your phone like a regular phone call.