Question : Problem: Voice chat between mac os X and PC users over internet

This seems like a simple question: is there a way to do voice chat (i.e. Internet phone) over the internet for users on different platforms? Specifically, I'm runing Mac OS X 10.2 and my chat partner is running a PC (version unknown, Windows presumed; probably whatever was most recent about 8 months ago when she bought it).

She wanted to do Yahoo Chat, but the voice chat seems to be only working with the Windows version. Suggestions?

Answer : Problem: Voice chat between mac os X and PC users over internet

I believe AOL Instant Messagner will do the trick.  I tried it once a while back in the office over a fast connection.  But to tell you the truth, it wasn't worth it.  Not sure if the OSX version has it, but the OS9 version did and may work wiht classic.  There is also Mac2Phone for computer to phone connections and QuickVoice for talking email.