Is it possible to

[tossedmycookies]

Connect the telephone to the computer and use a headset as the reciever for the phone?

[degsy]

Dunno, but there are a few VoIP services available.

Phones over the Internet.

[Miz]

A good overview of internet telephony is on this page (http://www.iptel.org/info/) along with some links to more resources.

[ogilby]

Yes It Is Possible To Do This But It Depends Who Your Telephone Company Is. Sometimes You May Even Need Some Software To Make This Happen

[keith.evans]

The new version of Yahoo Messenger now has a communicator built in whereby you can wear a headset and make/receive calls even if you're on dial-up.