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- A trunk connecting one or more end offices to a toll center as the first stage of concentration for intertoll traffic. Note: Operator assistance or participation may be an optional function. In U.S. common carrier telephony service, a toll center designated "Class 4C" is an office where assistance in completing incoming calls is provided in addition to other traffic; a toll center designated "Class 4P" is an office where operators handle only outbound calls, or where switching is performed without operator assistance.
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- add-on conference, attendant access loop, attendant position, dial service assistance (DSA), Directory Assistance Call Completion (DACC), fixed loop, three-way calling, toll diversion