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Featured Categories : Study Books : Professional : Engineering : Electronics & Telecommunications Engineering : Telephone & Wireless Technology
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The authors of Voice over IP Fundamentals--three packet-voice specialists at Cisco Systems--initiate their exploration of next-generation technologies for supporting conversations across large distances: the switched telephone network as implemented on large (intercontinental) and small (building and enterprise) scales. They then proceed to point out problems with the old way of doing things, and illuminate the standards and regulatory conditions that have made Internet telephony attractive. Signalling System 7 (SS7) gets particularly insightful coverage, with ample graphical support for the authors' clear and fact-rich, example-laden prose.The authors do a great service for readers by breaking packet telephony into its component technologies and explaining each carefully. Coverage of the various protocols that enable voice over IP, particularly H.323 and Session Initiation Protocol (SIP), is simultaneously clear and deep. The same goes for media gateway protocols and various schemes for translating sounds into digital signals and back again, while retaining maximum clarity. There is even some practical material: concluding chapters diagram Cisco router configurations for voice traffic, and flesh out solutions with case studies.
You will like this book if you need to implement a voice over IP system and know more about IP than you do about traditional voice telecommunications. The authors' patient and detailed explanations of traditional telephony concepts and voice over IP protocols will mesh nicely with your existing data communications knowledge, enabling you to make wise design and product decisions. --David Wall, amazon.com
Topics covered: The Public Switched Telephone Network (PSTN), signaling specifications (including Bell System, ISDN, and Signaling System 7), the basics of Internet Protocol (IP), modulation and compression of voice, Quality of Service (QoS), H.323, Session Initiation Protocol (SIP), and gateway protocols. Business considerations of Internet telephony also get coverage.
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Cisco Systems has lately become aggressive in promoting applications of the IP network infrastructure equipment that the company has traditionally sold. Cisco CallManager--the subject of Cisco CallManager Fundamentals--is essentially an IP-based Public Branch Exchange (PBX) that enables companies to carry their voice and data traffic on a single network infrastructure. This book explains how CallManager (originally developed by Selsius Systems) goes about providing call-control services to IP telephony devices and performing reliably as a corporate telephone switch, and offers insight into how the product may evolve. This book provides systems architects, engineers and implementation technicians with the details they need to build strong CallManager systems.Written by members of the CallManager development team and extensively edited for accuracy, Cisco CallManager Fundamentals uses prose and remarkably clear network diagrams to make its points. People looking for a detailed understanding of how CallManager works will find themselves delighted. While technicians looking for click-this, click-that procedures will be generally disappointed (such didactic techniques are not typical of Cisco Press books), they will find a fair number of sections that explain, in general terms, how to do such administrative work as loading users' names into a CallManager database and routing calls to emergency numbers. --David Wall
Topics covered: All aspects of Cisco CallManager, versions 3.0x and 3.1, of interest to the people who design, implement, and maintain the IP telephony solution. Matters of system architecture (with plenty of information about hardware and network requirements), call routing, media processing, and reporting are all covered. Neither details of CallManager's integration with the Intelligent Contact Manager (ICM) business-rules engine, nor much information on external Computer Telephony Integration (CTI) applications, are included here.
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