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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 4. Applications in the IP Multimedia Subsystem

4.1. Introduction

Competition from new players, convergence of legacy circuit-switched (fixed and mobile), IMS and Internet services, and the resulting disruptive innovation drive operators to improve their efficiency and agility. Service-Oriented Architecture (SOA) is a paradigm shift that leads to software architectures driven by business objectives and thereby enables agile systems capable of flexibly and rapidly executing strategic decisions.
SOA requires building and managing software systems focusing on the services they provide, rather than the technology they use. Such systems typically achieve efficiency by rapidly assembling new services by creating their functionality through reuse ...

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