Keynote ranks top VOIP services: Vonage and CallVantage

Keynote Systems measured the performance of popular VOIP providers. Service from Vonage, Time Warner Cable and MCI scored the highest on reliability.

Keynote Systems measured the performance of popular VOIP providers. Service from Vonage, Time Warner Cable and MCI scored the highest on reliability. AT&T CallVantage got the highest score on voice clarity.