toll switching trunk

{{Short description|Element of American telephony}}

In telecommunications, a toll switching trunk or toll connecting trunk[http://leegoeller.com/DigFuture/Chap7.htm The Digital Future, 1979] Toll connecting trunk is a trunk connecting an end office 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.{{cite web|url=http://etler.com/docs/WECo/Fundamentals/files/10-4AToll.pdf |archive-url=https://ghostarchive.org/archive/20221009/http://etler.com/docs/WECo/Fundamentals/files/10-4AToll.pdf |archive-date=2022-10-09 |url-status=live |title=4A Toll Switching System}}