Toll switching trunk

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In telecommunication, a toll switching trunk or toll connecting trunk[1] is a trunk connecting one or more end offices to a toll center as the first stage of concentration for intertoll or long distance traffic.

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.


  1. ^ The Digital Future, 1979 Toll connecting trunk