Can i use Netmeeting to speak with someone abroad on their office PCs?

I have friends & relatives abroad who use their home as well as office PCs. Is it possible for us to use Windows Netmeeting to voice chat on their home & office PCs?

If yes, please can any1 also inform about the exact configuration set-ups which may be required for same as i am very new to all this?

Just for info i use cable internet connection & am not sure about the opposite parties.

Cheers !

Tim