Chapter 23. SIP Networks

In previous chapters, we saw some examples of functions implemented in the network, as opposed to in the endpoints, in order to deliver multimedia communication services. In this chapter, we will put these ideas into perspective and try to better understand what the role of the network is in this remit. The first section discusses the role of the network. Then we make a brief summary of the network functions analyzed throughout the book so far. This chapter focuses on the IETF perspective, and can be seen as a preparation for the next chapter about 3GPP IMS, where the ideas about an IP multimedia communications network are taken a step further and many new requirements are defined.

The Role of the Network

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