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There have been significant technological advancements in recent years in the automation of handling, switching, and accounting of telephone toll calls and other operator-assistance types of calls. The concept of the Traffic Service Position has been developed to speed and standardize human operations for all kinds of calls involving operators. Several features of the ADDDS system installed at Las Vegas, Nev., for the Central Telephone Company of Southern Nevada are described. A wide versatility of the operator position readily accommodates various difficult to handle categories of calls, such as time-and-charge, delayed, emergency, leave word, paystation calls, and others. An extremely effective system is used to monitor and control traffic to the operators under congestion conditions and to predict and adjust operator force size. A fully automatic scheme is used to deliver time-and-charge-information for calls made by guests of hotels, using teletypewriter techniques, within a few seconds of completion of the calls. A special solid-state and ferrite core computer serves the triple function of computing charges for: 1) Prepay coin telephone calls 2) Time-and-charge calls for hotel guests 3) All calls that are machine ticketed for preparation of billing. This system, cut into service in November 1964, serving approximately 80 000 subscribers and producing 15 to 20 thousand tickets a day, is equipped with 120 operator positions.