Voice over IP Fundamentals, Second Edition

Chapter 7. VoIP: An In-Depth Analysis

To create a proper network design, it is important to know all the caveats and inner workings of networking technology. This chapter explains many of the issues facing Voice over IP (VoIP) and ways in which Cisco addresses these issues.

Communications via the Public Switched Telephone Network (PSTN) has its own set of problems, which are covered in Chapter 1, “Overview of the PSTN and Comparisons to Voice over IP,” and Chapter 2, “Enterprise Telephony Today.” VoIP technology has many similar issues and a whole batch of additional ones. This chapter details these various issues and explains how they can affect packet networks.

The following issues are covered in this chapter:

• Delay/latency

• Jitter

• Pulse Code Modulation ...