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VoIP Still Lags Traditional Telephone Networks in Call Quality


27/10/2007

VoIP users in the U.S. are still experiencing significant sound quality and audio delay problems, according to a recent study by performance monitoring firm, Keynote Systems.

The study measured twelve major VoIP and digital phone providers in terms of service availability, call completion rates, and audio delay, and determined that although these services have improved in recent years, they continue to lag behind traditional landline carriers like Verizon and AT&T.

“Our key finding here is that there has been significant improvement for VoIP services, but there is still a difference in terms of quality of calls,” commented Keynote’s VoIP manager, Rajeev Kutty.

Most cable phone services now have audio delay times of less than 150-milliseconds, according Keynote, rendering them more or less unnoticeable. Non-cable VoIP providers measure delays of between 149- and 279-milliseconds, however, and most have call disconnection rates of more than 1%.

The study was carried out by placing more than 125,000 calls between New York and San Francisco over a period of one month. It is Keynote’s fourth study comparing VoIP providers with Public Switched Telephone Networks in terms of call quality.



 

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