instance), latency in a two-way phone conversation can be very undesirable. 150ms is the specified maximum desired one-way latency 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,
Big Wells dial up internet access, Big Wells, TX up internet access dial Big Wells
Big Wells up internet access, dial Texas, Big Wells dial up internet access
