Telephony - meaning 'sound over distance' - refers to electronically transmitting the human voice. Originally telephony dealt only with analog signals in the circuit-switched networks of the telephone companies. It later referred to a mix of analog and digital circuits, but still with the telephone industry. Starting in the 1990s, telephony began to embrace sending voice over IP (VoIP) networks, which is now widely deployed by common carriers, private enterprises and independent VoIP providers.
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