to achieve high-quality voice. Voice users will notice round-trip delays that exceed 250ms. More than that, and callers start talking over each other. At anything beyond 500ms phone calls are no longer practical. It would be like asking a question and getting the answer after you've gone to lunch. As a reference, the typical delay when speaking through a geo-stationary satellite is 150-500ms. Delay in data networks is not as critical.
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