Since the Fritzbox manufacturer AVM the TR0 64 – management protocol in FritzOS, there are some solutions that redirect the front door bell signal to a DECT Enable telephone. This means that the phone rings when someone presses the doorbell button.

If you use such a circuit, it’s all well and good: it rings at the front door and on the phone. But how do you get the door open now?

Such a remote switching function over the telephone would be very helpful, especially for disabled people or elderly people, for example to give the postman access to the post boxes in multi-party rental houses to enable in the hallway or to open the garden door in single-family houses. With the TR0 64 – Protocol does not work. And that’s where my project starts.

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