Chapter 1 Introducing Voice over IP Networks

Voice over Internet Protocol (VoIP) allows a voice-enabled router to carry voice traffic, such as telephone calls and faxes, over an Internet Protocol (IP) network. This chapter introduces the fundamentals of VoIP, the various types of voice gateways, and how to use gateways in different IP telephony environments.

VoIP Fundamentals

Voice over IP is also known as VoIP. You might also hear VoIP referred to as IP Telephony. Both terms refer to sending voice across an IP network. However, the primary distinction revolves around the endpoints in use. For example, in a VoIP network, traditional analog or digital circuits connect into an IP network, typically through some sort of gateway. However, an IP ...

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