Automating Operator Assistance
Some nice .pdf files on automating operator assistance:
"An Automatic Direct Distance Dialing System" by T. B. Caveny, JR. (December, 1966) (internal link) "An automatic toll ticketing system was cut into service in Las Vegas, Nevada, on November 22, 1964, providing some services never before available. The general purpose relay used in this system embodies imaginative new concepts in. device design and application. . ."
"Toll Service Desk: An Improved Concept of Telephone Toll Traffic Control" by D. E. Halbedel (December, 1969) (internal link) "A new toll service desk (T.S.D) system has been developed and successfully introduced, which greatly reduces the human involvement in the processing of operator-assisted telephone toll calls. . ."