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Call forwarding refers to the ability to redirect a Directory Number (DN) from one destination to another Directory Number. This feature can be activated and deactivated at any time from the subscriber’s telephone set.
Electronic switching systems have the ability to redirect an incoming call to either another Directory Number within the same exchange, or to another exchange over a trunk line. When a call is redirected by the switch, the call content is not transmitted to the subscriber’s line, but instead is rerouted at the switch.