Chapter 2. IP Multimedia Subsystem architecture
This chapter introduces the reader to the Internet Protocol (IP) Multimedia Subsystem (IMS). Section 2.1 explains basic architectural concepts: for instance, we explain why bearers are separated and why the home control model was selected. Section 2.2 gives a wide overview of IMS architecture, including an introduction to different network entities and main functionalities. Section 2.3 goes deeper and shows how the entities are connected and what protocols are used between them; it also describes their relationships to other domains: IP networks, Universal Mobile Telecommunications System (UMTS) and Circuit Switched Core Network (CS CN).
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