Voice over Internet Protocol phone systems still lag significantly behind the traditional phone network for reliability and quality, and there are major differences in quality among brands of VoIP service, according to a company that evaluated six U.S. providers.
Keynote Systems tested the services for reliability and quality by making domestic long-distance and local calls from VoIP services to the PSTN (public switched telephone network) in May and June this year. Call quality was evaluated by software and used an industry standard for listening quality, according to Dharmesh Thakker, senior product manager at Keynote.
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