BuddyPhone gives you all you need (except the microphone of course) to get started in Internet telephony. Using it is extremely easy too, just type in the IP address of the other user to open a connection. Other core features include auto-answer, call blocking, and answering machine. BuddyPhone is a great product, but the large Ad sponsor banners make it look a little unwieldy, but you can always pay the registration fee to remove this.