Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.

IN is the intelligent portion of the public telephone network that contains the logic for routing calls, establishing connections, and providing advanced features such as unique customer services and custom programming of the network. You will also hear about the AIN (Advanced Intelligent Network). It was supposed to provide a way for customers to deploy services, but was never fully developed.