Voiceover Internet Protocal (VoIP): Evaluation of Technologies for Deployment

Voiceover Internet Protocal (VoIP): Evaluation of Technologies for Deployment

Bhumip Khasnabish (Verizon Labs, USA)
Copyright: © 2002 |Pages: 31
DOI: 10.4018/978-1-930708-17-4.ch009
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Abstract

Traditionally, real-time voice communications–both within and outside of corporations (enterprises)—are achieved using public domain circuit-switched telephone networks (PSTNs). These networks use technologies that have been maturing over the last 150 years. However, the recent advances in and proliferation of packet-based switching technologies, World Wide Web (WWW) and PC-based user interfaces, and innovative digital signal processing (DSP) techniques are making real-time voice transmission using packet switching–particularly IP-based techniques—more feasible, at least within the logical boundaries of enterprise networks. Although the IP-based Internet is only about 25 years old, its compatibility with Ethernet2 , and its flexibility, openness and low-cost availability have enabled it to gain more than 260 million users worldwide3. In addition, proliferation of the WWW, multimedia PCs, and innovations in DSP during the last five years has made voice transmission over packet networks, particularly over IP, very attractive economically. In this chapter, we briefly review the technologies and standards—as recommended by IETF and ITU-T—that are making voice over IP (VoIP) a reality in both public and enterprise networks. Our focus is on low bit rate speech compression and silence suppression, voice packetization and encapsulation, sources of packet-voice impairments and methods to mitigate them, and packet-voice transmission engineering.

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Table of Contents
Preface
Vasilis Theoharakis , Dimitrios N. Serpanos
Chapter 1
Vasilios A. Siris
In this chapter we give the motivation and basic concepts of the OSI reference model, discuss its seven-layer architecture, the communication... Sample PDF
The OSI Model and Switching
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Chapter 2
Mike Fisk
As computer networks, specifically the Internet, become more and more integral to business and society, the performance and availability of services... Sample PDF
Network Service Availability and Performance
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Chapter 3
Dimitrios Pendarakis, Subir Biswas
In this chapter we first present a brief overview of the technologies that have enabled the spectacular growth in optical networking. Next, we... Sample PDF
Management and Control of Intelligent Optical Networks
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Chapter 4
Cam Cullen
With the availability of so many high-density, wire-speed Layer 3 switches, why would a network administrator choose to implement Virtual LANs... Sample PDF
Virtual Local Area Networks
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Chapter 5
IP Switching and MPLS  (pages 61-87)
S. Manikantan
The growth of the Internet and its widespread usage has lead to greater demands being made on the industry to provide faster and better solutions.... Sample PDF
IP Switching and MPLS
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Chapter 6
Web Switching  (pages 86-104)
Vishal Sharma, Rakhi Sharma
Web switching may be viewed as an optimized combination of networking functions, such as load balancing, bandwidth and traffic management, cache... Sample PDF
Web Switching
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Chapter 7
Luiz A. DaSilva
Today’s networks support applications that deliver text, audio, images and video, often in real time and with a high degree of interactivity, using... Sample PDF
Multilayered Quality of Service
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Chapter 8
Mahbub Hassan, Sanjay Jha
As the name suggests, voice over Internet Protocol (VoIP) refers to the technology that allows transmission of voice over IP networks. Using VoIP... Sample PDF
Voiceover IP: Protocols and Technical Hurdles
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Chapter 9
Bhumip Khasnabish
Traditionally, real-time voice communications–both within and outside of corporations (enterprises)—are achieved using public domain... Sample PDF
Voiceover Internet Protocal (VoIP): Evaluation of Technologies for Deployment
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Chapter 10
Christine Perey
Historically, interactive video has been reserved for circuit-switched networks (e.g., ISDN) using the H.320 standard protocol for video signaling... Sample PDF
Interactive Video on Enterprise Networks
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Chapter 11
Bhumip Khasnabish
This chapter along with the additional resources given in the references will support the usage of SAN technologies in enterprises. The first half... Sample PDF
Emerging Enterprise Storage Systems: Storage or System Area Networks (SANs)
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Chapter 12
S. Raj Rajagopalan
Security is one of the most pressing and expensive problems in the management of modern enterprise networks. The objective of this chapter is to... Sample PDF
Managing Security in Modern Enterprise Networks
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Chapter 13
Web Caching: A Survey  (pages 234-248)
Antonis Danalis, Evangelos Markatos
World Wide Web traffic increases at exponential rates saturating network links and web servers. By replicating popular web pages in strategic places... Sample PDF
Web Caching: A Survey
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Chapter 14
Tony Mancill
LinuxTM has made a lot of noise in the media recently, but wide-scale corporate adoption has been cautious. This chapter introduces the reader to... Sample PDF
Linux Systems as Network Infrastructure Components
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About the Authors