Chapter 24. The IMS

In this chapter, we will introduce the 3GPP IP Multimedia Subsystem (IMS). The topic would deserve several books on its own, so in this chapter we will focus on just the key ideas. The main purpose of this chapter is to let the reader understand how the ideas around Internet multimedia that we learned throughout the book are applied in a concrete multimedia network intended for the telecom operators’ environment.

In order to explain the IMS architecture, we will not follow a top-down approach, where the overwhelming IMS architecture with all its unintelligible names is presented first, and then the components are detailed. Instead, we will use our recently acquired knowledge of SIP and SIP network architectures to understand ...

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