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Ringdown
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== Ringdown operator == In telephone systems where calls from distant automated exchanges arrive for manual subscribers or [[non-dialable point]]s, there often would be a ringdown operator (reachable from the distant operator console by dialling NPA+181) who would manually ring the desired subscriber on a [[party line (telephony)|party line]] or toll station. On some systems, this function was carried out by the [[switchboard operator|inward operator]] (NPA+121). In both cases, this is a telephone operator at the destination who provides assistance solely to other operators on inbound toll calls; the ringdown operator nominally cannot be dialed directly by the subscriber.
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