How to Cheat at VoIP Security
If VoIP engineering is not your specialty, this guide provides an introduction to VoIP security, and covers exploit tools and how they can be used against VoIP systems.
TABLE OF CONTENTS How to Cheat at VoIP Security
Chapter 3: Architectures
Introduction
In this chapter we discuss the architecture of the Public Switched Telephone Network (PSTN), the architecture of networks based on the H.323 protocol, and the architecture of IP networks based on the Session Initiation Protocol (SIP). Its essential to include the PSTN and its associated risks when examining VoIP security. The PSTN has evolved considerably in recent years, but the addition of VoIP services also has created new and novel vulnerabilities for both data and voice. H.323 and SIP are signaling protocols that is, they are involved in call setup, teardown, and modification.
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