How to Cheat at VoIP Security

Appendix B

The IP Multimedia Subsystem: True Converged Communications

Solutions in this chapter:

■ IMS Architecture

■ Communication Flow in IMS

■ IMS Security Architecture

■ IMS Security Issues

Introduction

The IP Multimedia Subsystem (IMS) is a next-generation multimedia communication framework that encompasses mobile, fixed, packet-switching, and traditional circuit-switching communication systems. It has been proposed by the Third Generation Partnership Project (3GPP) and uses the Voice over Internet Protocol (VoIP) framework, especially the Session Initiation Protocol (SIP) standard. The 3GPP is a standards organization driven by wireless carriers and equipment manufacturers and aims at producing globally applicable specification and reports for ...