Chapter 18. Interworking with PSTN/PLMN
In this chapter, we will tackle the integration of IP multimedia networks with the existing fixed (PSTN) and mobile (PLMN) circuit-switched networks in order to enable different types of communication scenarios. We begin the chapter by explaining what the motivation for the integration is. Then we present the high-level architecture that enables the identified scenarios. After that, we will look into specific aspects of the integration, such as addressing, protocol translation, and protocol encapsulation.
We have seen that IP multimedia communications encompass the exchange of different types of media. Telephone calls can be seen as a type of multimedia sessions where just audio is exchanged. ...