Automatic Intercept System: Operational Programs

The stored program for the Automatic Intercept System (AIS)1 directs the operation of equipment which processes intercept calls. The system is designed to meet stringent operational requirements similar to those imposed on other stored program switching systems, such as the No. 1 Electronic Switching System (ESS).2 AIS provides rapid, reliable, and economical intercept service and supports simple administrative and maintenance procedures. This paper describes the programs that process calls as well as some of the administrative and maintenance programs. Companion papers cover the remaining parts of the AIS program. 3-5 Intercept calls differ in several significant ways from calls served by typical local or toll switching centers. These differences have been exploited wherever possible to simplify the system design. Most influential among these factors are the following: (i) The variety of services and number of options required are relatively limited, (u) There are no subscriber-to-subscriber connections. (Hi) Calls have short holding times (the average call is less than 19