Vonage, AT&T Rank Above VoIP Providers

A study by Keynote gives those two firms top marks in reliability and audio clarity, respectively. Keynote rated AT&T CallVantage Packet 8, Primus Lingo, SkypeOut, Verizon Voicewing and Vonage in its study of overall VoIP service quality. Vonage rated first overall, with a significant gap between it and the other five services.

• Service Availability - indicating the reliability of the service  • Outage Hours - how many minutes the service was unavailable during the study collection period and on a daily basis  • Average number of call attempts - how many times, on average, a user must call to establish a connection  • Dropped Calls - the number of times a call is dropped in the midst of a conversation  • Audio Delay - once the call is established, the average lag between utterances. High audio delay leads to overlapping and unpleasant conversations in real-life.  • Listening quality (or Mean Opinion Score - MOS) measured using the Perceptual Evaluation of Speech Quality scale (PESQ) - the internationally recognized ITU-T P.862 standard  • Audio delay consistency over time  • Audio delay geographic uniformity between New York and San Francisco  • MOS consistency over time  • MOS geographic uniformity between New York and San Francisco David Utter is a staff writer for Murdok covering technology and business. Email him

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