Toll

From DictionGloss

toll diversion - A system service feature by which users are denied the ability to place toll calls without the assistance of an attendant.

toll office - A central office used primarily for supervising and switching toll traffic.

toll quality - The voice quality resulting from the use of a nominal 4-kHz telephone channel.

toll switching trunk - A trunk connecting one or more end offices to a toll center as the first stage of concentration for intertoll traffic.