Toll switching trunk
Element of American telephony
In telecommunication, a toll switching trunk or toll connecting trunk[1] 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.[2]
References
- This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22. (in support of MIL-STD-188).
See also
- Class-4 telephone switch
- v
- t
- e