July 13th, 2005
Part 3- Here are the results of the Keynote Systems Tests
In Part I and Part II of my look at the Keynote Systems VoIP call quality test, I reviewed the methodologies Keynote Systems used to study and then rate VoIP carriers and providers.
In this section, I will name the winners, as determined by Keynote:
Most Reliable VoIP Service Provider- Vonage.
Best Audio Clarity- AT&T CallVantage.
Most Reliable Network Carrier- Time Warner Cable.
(Network Carrier with) Best Audio Quality-a tie between UUNET (now known as MCI Wholesale Network Services and Time Warner Cable.
Keynote has also released breakdowns for three individual call quality characteristics of VoIP provider calls:
Service Availability (percentage of calls that were successful): Vonage Soft Phone was first, followed by the standard Vonage service.
Average MOS (Average Mean Score of voice audio quality)- The standard Vonage service finished first, followed by AT&T CallVantage.
Average Audio Delay (the average amount of time it takes audio to travel from caller to recipient)- AT&T CallVantage led, followed by Vonage Soft Phone.
Parsing these results, it appears that for the best VoIP call audio quality, you couldn’t do any better than placing an AT&T CallVantage VoIP call over a high-speed Time Warner Cable connection. But if that call absolutely, positively has to get through, then a Vonage call over Time Warner Cable would be the way2go.
Russell Shaw is an enterprise computing journalist, analyst and author based in Portland, Oregon. See his full profile and disclosure of his industry affiliations.
