3G IP Multimedia Subsystem (IMS): Merging the Internet and the Cellular Worlds, Second Edition is the latest version of the best-selling guide this exciting technology that will merge the Internet with the cellular world, ensuring the availability of Internet technologies such as web, email, instant messaging, presence and videoconferencing nearly everywhere. In this thoroughly revised overview of the IMS and its technologies, goals, history, vision, organizations involved in standardization and architecture, the authors first describe how each technology works on the Internet and then explain how the same technology adapted to work in the IMS, enabling readers to take advantage of any Internet service current and future. The main feature of the Second Edition include: New chapter on Next Generation Networks, including the idea of standardization, architecture, and / PSTN ISDN simulation services.