Chapter Organization

Chapter 1, "Overview of the PSTN and Comparisons to Voice over IP," contrasts the similarities and differences between traditional TDM networks and networks running packetized voice.

Chapter 2, "Enterprise Telephony Today," Chapter 3, "Basic Telephony Signaling," Chapter 4, "Signaling System 7," and Chapter 5,"PSTN Services," cover enterprise telephony, the basics of PSTN signaling, Signaling System 7 (SS7), and other PSTN services. These chapters provide the background information needed by data networking professionals who are just stepping into the voice realm. They also act as a good primer for those in specific voice areas that want to brush up on various other voice-networking protocols.

Chapter 6, "Voice over IP Benefits and Applications," contrasts and compares in detail how packet voice can run the same applications as the current telephony system but in a more cost-effective and scalable manner.

Chapter 7 is an introduction into the world of IP. Basic subnetting and the Open Systems Interconnection (OSI) reference model are covered, and comparisons between Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) are provided.

Chapter 8, "VoIP: An In-Depth Analysis," and Chapter 9, "Quality of Service," go into great detail on VoIP and how all the functional components fit together to form a solution. They include discussions of jitter, latency, packet loss, codecs, QoS tools, mean opinion scores (MOSes), and the caveats to consider when implementing packet voice networks.

Chapter 10, "H.323," Chapter 11, "Session Initiation Protocol," Chapter 12, "Gateway Control Protocols," and Chapter 13, "Virtual Switch Controller," cover the various signaling protocols and how they are wrapped together using Cisco's Virtual Switch Controller (VSC). These chapters enable implementers to understand how all the various VoIP components set up calls, tear down calls, and offer services.

Chapter 14, "Voice over IP Configuration Issues," and Chapter 15, "Voice over IP Applications and Services," cover the functional components of using Cisco gateways to deploy a VoIP network. These chapters include configuration details and sample case studies.

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