Toll switching trunk

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.

References

1. The Digital Future, 1979 Toll connecting trunk

•  This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).