For many years, voice over IP (VoIP) has held the promise of enabling the next generation of voice communications within the enterprise. Unfortunately, its adoption has been slowed; sometimes by the reality of poor performing IP-PBX systems, in other cases by perceptions that VoIP technology is not quite ready for prime time. These problems — both real and imagined — have forced IT organizations and VoIP vendors to take a closer look at the technology and ensure that IP-PBX solutions deliver the features, quality, and reliability that customers demand.