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Traditionally when one wishes to make a phone call, a call is placed using a telephone that is connected to a circuit-switched network.
In a circuit switched network, network resources are static; the network resources are allocated from the sender to the receiver before the start of the voice transmission. Two points are connected in both directions thus creating a "circuit". The resources remain dedicated to the circuit during the entire transfer and the entire voice transmission follows the same path, this is the foundation of the PSTN.
Up until circa 1960, every call had a dedicated wiring stretching from one end of the call to the other for the duration of the call...
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