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IMS Application Developer's Handbook by Mats Stille, Anders Ryde, Ioannis Fikouras, Catherine Mulligan, Ulf Olsson, Rogier Noldus

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Chapter 11. Interworking with Legacy Networks

11.1. Introduction

This chapter provides the user with “the bigger picture”, by placing the IMS network in a larger context. In Chapter 7 and Chapter 8, we introduced a number of interconnection points between the IMS network and other networks. For example, the media gateway control function (MGCF) and IP multimedia media gateway (IM-MGW). These entities allow connection of the IMS network to circuit-switched (CS) networks, e.g. the Public Switched Telephony Network (PSTN) or the Public Land Mobile Network (PLMN). In this chapter, we will consider the impact of network interconnection (connecting IMS network to CS network) on the availability of services in the IMS network.
A further topic we will look ...

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