This document provides an overview of Cisco's IP phone portfolio, including the 3900, 6900, 7800, 7900, and 8800 series. It describes the intended uses and key features of each series. The 3900 series is designed for occasional-use VoIP communications, such as lobbies and classrooms. The 6900 series is for specialty-use settings. The 7800 and 7900 series are for general business communications, with the 7800 targeting light-to-moderate use and the 7900 targeting general business voice-focused endpoints. The 8800 series enables next-generation video and voice communications with features like HD video and Bluetooth integration.