I want to connect an analog telephone set with Raspi which will house a telephone directory. Using telephone set's digits (alphabets) any user shall interact with GUI on Raspi to search for a number. Then picking up of the cradle to make the call through to the desired (searched) number. So basically Raspi to have a GUI with complete telephone directory and some interface with the telephone set.
I have this post useful, but it is using pi as a telephone set and the idea of a GUI with a telephone directory is missing.
I am new to the world of pi.