How do I use a phone (I think called rj11) expansion card with a computer hooked up to the internet?

I don't get a dial tone when I use my cord phone connected to the wall, so I plugged it into my computer's phone port expansion card (on the port labeled phone), plugged my computer into the wall with the wall phone cable (using the port labeled line), and connected my computer to the internet, which works. I still don't get a dial tone. How do I configure my computer (which runs xp) to be able to allow calls to pass through it?

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