This is a quesiton for your thought...
I am thinking of building an application that receives a telephone call via a modem. I want to play a recorded message (welcoming message) and ask the user to key in his/her pin number on the telephone pad. This means that I want to be able to detect the tones from the key pad.
Now, I am not sure how hard this project is going to be but I am looking for ideas, suggestions or sample components that does a similar thing. I guess it would be helpful if someone can tell me how I can play a message on the modem and receive key pad tones...
Note: I am not looking for complete answers, but rather a pointer to where I should start. Points will increase depending on the complexity/throughness of the answer required.