Still using Skype for VoIP calls? Oh my god, that is so 2006 (or earlier, even). You don't need to have the extra application wasting precious system resources any more because for many months now PC-to-Phone calling is already there on your desktop, baked into Windows Live Messenger.
Tests have proven that the sound quality of Windows Live Call is at least as good as Skype's, but maybe you want to put that to the test yourself. You can, and thanks to Verizon it will cost you absolutely nothing. All users of the Windows Live Messenger 8.1 Beta from Austria, Belgium, Finland, France, Germany, Ireland, Italy, Spain, The Netherlands, the United Kingdom or the United States are offered two free calls lasting three minutes maximum to almost any fixed line or mobile number in the world. Just click the little telephone icon in your dashboard and you're off.