Prospect of DTMF keypad as computer's keyboard

We have already some technologies to perform these types of application such as: Bluetooth, IR. However these are used in a limited area which we can easily come over in the proposed system. This system has two sections one is Remote Section (RS) where the client will place the request and another is Local Section (LS) where the telephone line is connected with an Input Interfacing Circuit (IIC). In the LS, this IIC is connected with a computer. IIC detects the frequency and converts frequency into machine language then it sends to computer through parallel ports. Computer processes this signal and provides the respective keys. This system can be used in commercial or industrial purposes such as controlling computer from remote locations, home monitoring or inquiry system instead of man or any kind of switching. Therefore it can save money as well as man power with efficiently.