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Internetworking Technologies Handbook, Fourth Edition by Cisco Systems, Inc.

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Chapter 24. VoIP

Objectives

  • Understand H.323 network devices.

  • Work with the H.323 protocol suite.

  • Know the Session Initiation Protocol (SIP).

  • Describe connecting VoIP networks with the SS7 network.

Chances are that even if you are new to the networking industry, you have heard of voice over Internet Protocol (VoIP). VoIP is the transport of voice traffic over an IP infrastructure rather than over the traditional time-division multiplexing (TDM)-based telephone network, also called the public switched telephone network (PSTN). VoIP refers to the transport of voice at the network layer of the International Organization for Standardization's (ISO's) open systems interconnection (OSI) model.

VoIP has been gaining momentum in the industry over the past few ...

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