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- A domestic telecommunications network usually accessed by telephones, key telephone systems, private branch exchange trunks, and data arrangements. Note: Completion of the circuit between the call originator and call receiver in a PSTN requires network signaling in the form of dial pulses or multifrequency tones.
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- call-selection time, dial tone, dialing, key pulsing, loop start, proceed-to-select, ringdown, rotary dial