REFERENCES
An Introduction to AT&T System 25
Provides an introduction to System 25 features and services. The emphasis is on how System 25 helps solve information management, productivity, and cost control problems.
Implementation Manual
Describes how to plan the system’s operating configuration. Explains how to determine customer needs and how to convert these needs into a system configuration plan. This plan is recorded on accompanying forms that are used in conjunction with the Administration Manual to initialize the system. The Implementation Manual and associated forms are packaged together in the Administration Records Binder.
Installation and Maintenance Manual
Provides 
ng System 25 and associated equipment. Includes procedures for testing equipment and trunks and for making additions and changes to the system. Also provides a detailed description of system operation and procedures for isolating and clearing
