Voice over IP (VoIP) isn't the same as Internet telephony. Most of the discussions among those of us associated with institutions that might have a PBX or a requirement to supply voice service to our users focus on VoIP. We tend to think of VoIP as a natural evolution, upgrade, or migration of existing voice systems. We tend to dismiss Internet telephony as something capable of replacing our current global voice architecture. Internet telephony as we know it today may have appeal only to small niche markets, but the Internet may change all that.