You won't be able to get the user's telephone number from AT&T without a court order. Dial-up is not a static IP, and therefore you would need to get into AT&T's logs to see who had that IP at the specific date/time.

"When I take action, I'm not going to fire a $2 million missile at a $10 empty tent and hit a camel in the butt. It's going to be decisive." - President George W. Bush

95 Contour SE ATX V6
"Cracked" Secondaries
DMD Installed
SVT Brakes