Yahoo Pc to Pc Calling in Linux

I am concidering dropping my Windows Xp in place of Ubuntu, but I use Yahoo Voice a lot. From what I can tell, Yahoo Unix does not have Pc to Pc calling or anything kind of voice chat system. So my question is, does Yahoo Unix have a voice chatting system or is there any program out there that is compatible with Yahoo Voice? Or is it true that Trillian Astra will have such compatibilities?