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CARRIER GRADE VOICE OVER IP McGraw-Hill Telecommunications Ali Ash Azzam Azzam/Ransom Bartlett Bates Bayer Bedell Cla. Source: Carrier Grade Voice Over IPCHAPTER1IntroductionDownloaded from Digital Engineering Library @ McGraw-Hil. Richard Swale; Daniel Collins,. ISBN: Carrier-Grade VoIP, Third Edition, shows how to set up and administer a highly reliable, unified communications.
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Introduction Chapter 1 4 All is not lost, however.
The Internet is changing rapidly in terms of its size, the number of users, and the technology that it uses. As technology changes and as more and more bandwidth is made available, it is possible that high-quality voice over the Internet may become the norm rather than the exception. However, that day is still not at hand. Consequently, while the term carrier-grade VoIP may not be an oxymoron, the term carriergrade voice over the Internet may well be. However, within this book, when we refer to VoIP, we generally exclude Internet telephony.
We shall see that high voice quality in IP networks requires the use of managed networks, QoS solutions, and service-level agreements SLAs between providers. In the meantime, a significant opportunity is available to deploy VoIP in networks where access and bandwidth are better managed. One such environment is that of next-generation Telcos, those companies building telephone networks using VoIP from the outset and posing a challenge to traditional carriers.
This means that traffic is broken into small packets that are sent individually to their destination. In the absence of special technical solutions, the route that each packet takes to its destination is determined independently at each network node on a packet-bypacket basis. IP is not the only packet-based protocol in existence. However, it is by far the most successful. The explosive growth of the Internet proves this.
IP itself provides no guarantees. For example, it is possible for different packets to take different routes from the origination point to the destination point, leading to the possibility of packets arriving at a destination in a different order than originally sent.
Not only can packets arrive out of sequence, but some packets might not arrive at all or might be severely delayed. To combat these shortcomings, other protocols have been developed to operate in conjunction with IP to ensure that packets are delivered to their ultimate destination in the correct sequence and without loss. Introduction Introduction 5 lost or delayed and the assembly of packets in the correct order at the destination end.
Although the mechanisms used by TCP are appropriate and successful for data transfer such as file transfers and e-mail , they are not appropriate for the delivery of voice traffic. Most data traffic is asynchronous and extremely error sensitive. For example, it hardly matters if an e-mail message takes 10 seconds or 30 seconds to reach its destination, but it is critical that every bit is received correctly.
On the other hand, voice traffic is synchronous in nature and a little more tolerant of errors.
In speech, when someone speaks, the listener should hear it practically immediately, although it is not as critical that every millisecond of speech is heard. Given that IP provides no guarantees regarding the efficient transport of data packets, one wonders why IP would even be considered as a means for transporting voice, particularly with the stringent delay requirements that voice imposes.
One also wonders how VoIP can be made to match the quality, reliability, and scalability of traditional networks. After all, if VoIP is to be a successful competitor to traditional telephony technology, then it must meet all the requirements met by traditional telephony, it must offer new and attractive capabilities beyond traditional telephony, and it must do so at a lower cost.
Why VoIP? It is probably best to break this question into two parts. The first is, why worry about carrying voice at all when a large and lucrative market for data services exists? The second question is, assuming that a carrier intends to compete in the voice market, why should IP be considered the transport mechanism? Why Carry Voice? IP and the Internet have led to many new and exciting services.
Whereas in the past it might have taken weeks to access certain types of information, it is now possible to find out practically anything in an instant. It is now possible to communicate at the touch of a button and to share information between colleagues, friends, and family. Introduction Chapter 1 6 to share information between their business systems and those of their suppliers and customers in order to reduce ordering times and streamline production.
All of this means that people are using IP technology in new and exciting ways. The technology has led to new revenue opportunities and to the creation of companies and enterprises to capitalize on those opportunities.
However, the revenues generated as a result of those opportunities are miniscule compared to the revenues generated by telephone companies who carry voice. Voice is still the killer application. To illustrate this point, let us look at some real examples.
In , Amazon.
Why Use IP for Voice? Manufactured in the United States of America. Except as permitted under the United States Copyright Act of , no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher. All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an editorial fashion only, and to the benefit of the trademark owner, with no intention of infringement of the trademark.
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