This Recommendation is intended to provide a detailed guide for the IN capabilities provided by Capability Set 1. This guide includes example service scenarios, as well as details to ensure an understanding and implementation of IN CS-1. This guide is targeted towards a wide audience that includes Users that only require a general “talking” knowledge on IN and how it will be utilized, as well as Users that need a detailed “working” knowledge of IN in order to complete their work function within an IN structured environment. This Recommendation is accompanied by two annexes which provide detailed example service scenarios and basic call state machine models.