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Echo is a troubling problem for telecom professionals. Most of them have suffered through a telephone call where they had to try to talk with a lot of echo on the wire. It's very distracting. Voice over IP does not create echo. However, due to the temporal aspect of echo, VoIP systems can and do increase the amount of echo heard during a telephone conversation. Echo cancellation is one of the more complex parameters that need tuning to preserve VoIP call quality. And IP networking specialists are increasingly finding that they must understand and monitor echo cancellation to manage their VoIP system.
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