The document provides instructions for using the basic features of the Avaya 1603/1603SW/1603-I/1603SW-I IP phone such as making calls, handling calls, conferencing, accessing voicemail and advanced features; it also describes the menu options for customizing settings like brightness, ring patterns, sounds and language. The document includes an overview of the phone buttons and features, descriptions of LED and display icons, and instructions for logging into and out of the phone.