be effective, voice data communication has to be a real time stream. (You wouldn't want to finish a sentence, then wait for many seconds before you could hear the other side answering.) With normal internet protocols, you can have a network consisting of many routers (20 - 30 or more) which can result in a very high round trip time (RTT). In addition to standard IP, VoIP uses the real-time protocol Leggett dialup , Leggett, CA dialup LeggettLeggett , dialup California, Leggett dialup
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