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Part I: Voice Perspectives - Pg. 3

CHAPTER 1 Traditional Voice Versus Unified Voice Welcome to the world of voice. No, not VoIP; you're not there yet. Before you can enter that world, a foundation must be laid. The traditional telephony network has been in place since the early 1900s, and it is not going to disappear overnight. Thus, until then, the new VoIP networks must integrate with traditional telephony networks. To perform this inte- gration, you must have a basic understanding of the world of traditional voice telephony. This chapter walks you through the foundations of the public switched telephone network (PSTN), private branch exchange (PBX) systems, and analog and digital circuitry. "Do I Know This Already?" Quiz The "Do I Know This Already?" quiz allows you to assess whether you should read this entire chapter or simply jump to the "Exam Preparation Tasks" section for review. If you