How to receive my landline calls into my pc?


I want to use my computer as a telephone instrument. Is there any method to use my pc as land-line phone. If yes then please tell me what software and hardware i needed.

Thank You

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I connect to Yahoo messenger through a proxy server and am unable to make free pc to pc calls and also not able to go to any chat rooms. the call button is not highlighted and when I try to get into chat line I get a message “signing in to Yahoo chat took longer than expected”. I am in a serious trouble.

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i have downloaded yahoo IM version 9.0 but im not been able to make pc to pc calls.