How can I receive phone calls on a Linux server and script stuff ...

I live in France and the ISP I've subscribed to provides a regular phone line along with my Internet connection. Here's a simple schema of my setup:

Since I don't use this phone line I would like to switch the regular phone with a computer (preferably running Linux) where I could receive/handle calls programatically. For example, execute a shell script if I press 2, that kind of thing.

How can I receive phone calls on a Linux server and script stuff depending on the numbers pressed?

Source: http://superuser.com/questions/451550/how-can-i-receive-phone-calls-on-a-linux-server-and-script-stuff-depending-on-th

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