Vonage, AT&T Top VOIP Ratings

A study finds Vonage to be the most reliable VOIP vendor, while AT&T's CallVantage Service is said to offer the best voice quality. (ExtremeTech)

Vonage was found to be the most reliable VOIP vendor in a study released this week, with AT&Ts CallVantage Service lauded as having the best voice quality.

Keynote Systems placed VOIP calls every 30 minutes on a variety of networks and services, evaluating every service for uptimes, call quality and audio delays.

VOIP calls have yet to exceed the standards and reliability of traditional POTS ("plain old telephone service") calls, the study found.

/zimages/5/28571.gifMCI launches a consumer VOIP-service trial. Read more here.

Vonage was found to be the most reliable VOIP vendor of those surveyed, which included AT&T CallVantage, Packet 8, Primus Lingo, Skype Technologies SAs SkypeOut service, Verizons Voicewing and Vonage America Inc., together with business DSL calls made over the AT&T, Sprint and UUNet SA networks.

/zimages/5/28571.gifClick here to read about the current state of VOIP regulations.

Vonage ranked first overall in the Keynote study as the most reliable VOIP service provider, with a normalized rank of over 80 points on a scale of 0 to 100, although the firm said that "Vonage still has room for improvement on the Dropped Calls performance factor."

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