The study measured 12 major VoIP and digital phone providers in terms of service availability, call completion rates, and audio delay, and found that although these services have improved in recent years, they still fall behind traditional landline carriers.
Most cable VoIP phone providers 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 making more than 125,000 calls between
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