How to use Linux as a dial-up provider?

[Kent West]

I don't know exactly the terminology to use. I'd like to set up a Linux 
box on the ethernet at home, slap a modem on it (attached to an analog 
line of course), and then dial-up from home to the modem, authenticate, 
and have internet access. In essence, I want to be my own ISP, allowing 
myself to dial into the T1 via my office Linux box.

Can anyone point me to HOWTOs?
Thanks!

Kent