Received and Decoder signnal from handset(NOKIA,SAMSUNG...)

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Nguyen Thanh Phuc

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When we call anyone, will have a signal is sent from ours phone to telepne exchange . This signal carries informations about number that we need call.
I want to receive and decoder this number to control a motor to open and close the door. Please kindly tell me circuit to do this. :?:

Thanks .
Thanh Phuc
 

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