Toll switching trunk

In telecommunications, a '''toll switching trunk''' or '''toll connecting trunk'''<ref>[http://leegoeller.com/DigFuture/Chap7.htm The Digital Future, 1979] Toll connecting trunk</ref> 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.<ref>{{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}}</ref>

==References== {{reflist}} *{{FS1037C MS188}}

==See also== * Class-4 telephone switch

Category:Communication circuits Category:Telecommunications economics