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The founders recognized that, at the time, most VoIP solutions were using existing technology developed for circuit switched networks, and were therefore not properly suited to handle the delay, jitter and packet loss presented by IP networks.
This aggregation of circuit-switching telephone networks has evolved greatly from the days of Alexander Graham Bell, and in the late 20th century became almost entirely digital in nature — except for the final link from the central (local) telephone office to the user (the local loop).