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VoIP For Dummies
by Timothy V. Kelly, Don Peterson Book Description
Put your phone system on your computer network and see the savings.
See how to get started with VoIP, how it works, and why it saves you money.
VoIP is techspeak for "voice over Internet protocol," but it could spell "saving big bucks" for your business! Here's where to get the scoop in plain English. Find out how VoIP can save you money, how voice communication travels online, and how to choose the best way to integrate your phone system with your network at home or at the office.
Discover how to:
- Use VoIP for your business or home phone service
- Choose the best network type
- Set up VoIP on a wireless network
- Understand transports and services
- Demonstrate VoIP's advantages to management
Switching to VoIP
by Theodore Wallingford Book Description
More and more businesses today have their receive phone service through Internet instead of local phone company lines. Many businesses are also using their internal local and wide-area network infrastructure to replace legacy enterprise telephone networks. This migration to a single network carrying voice anddata is called convergence, and it's revolutionizing the world of telecommunications by slashing costs and empowering users. The technology of families driving this convergence is called VoIP, or Voice over IP.
VoIP has advanced Internet-based telephony a viable solution, piquing the interest of companies small and large. The primary reason for migrating to VoIP is cost, as it equalizes the costs of long distance calls, local calls, and e-mails to fractions of a penny per use. But the real enterprise turn-on is how VoIP empowers businesses to mold and customize telecom and datacom solutions using a single, cohesive networking platform. These business drivers are so compelling that legacy telephony is going the way ofthe dinosaur, yielding to Voice over IP as the dominant enterprise communications paradigm.
Developed from real-world experience by a senior developer, O'Reilly's Switching to VoIP provides solutions for the most common VoIP migration challenges. So if you're a network professional who is migrating from a traditional telephony system to a modern, feature-rich network, this book is a must-have. You'll discover the strengths and weaknesses of circuit-switched and packet-switched networks, how VoIP systems impact network infrastructure, as well as solutions for common challenges involved with IP voice migrations. Among the challenges discussed and projects presented:
- building a softPBX
- configuring IP phones
- ensuring quality of service
- topological considerations
- coordinating a complete system? switchover?
- migrating applications like voicemail and directoryservices
- retro-interfacing to traditional telephony
- supporting mobile users
- security and survivability
- dealing with the challenges of NAT
To help you grasp the core principles at work, Switching to VoIP uses a combination of strategy and hands-on "how-to" that introduce VoIP routers and media gateways, various makes of IP telephone equipment, legacy analog phones, IP Tables and Linux firewalls, and the Asterisk open source PBX software by Digium. You'll learn how to build an IP-based or legacy-compatible phone system and voicemail system complete with e-mail integration while becoming familiar with VoIP protocols and devices. Switching to VoIP remains vendor-neutral and advocates standards, not brands. Some of the standards explored include:
- H.323, SCCP, and IAX
- Voice codecs
- Type of Service, IP precedence, DiffServ, and RSVP
- 802.1a/b/g WLAN
If VoIP has your attention, like so many others, then Switching to VoIP will help you build your own system, install it, and begin making calls. It's the only thing left between you and a modern telecom network.
Voice over IP Fundamentals
by Jonathan Davidson Book Description
A systematic approach to understanding the basics of Voice over IP
- Understand the basics of PSTN services and IP signaling protocols, including SS7
- Learn how VoIP can run the same applications as the existing telephony system, but in a more cost-efficient and scalable manner
- Delve into such VoIP topics as jitter, latency, packet loss, codecs, quality of service tools, and mean opinion scores
- Learn about the functional components involved in using Cisco gateways to deploy VoIP networks
Voice over IP (VoIP), which integrates voice and data transmission, is quickly becoming an important factor in network communications. It promises lower operational costs, greater flexibility, and a variety of enhanced applications. Voice over IP Fundamentals provides a thorough introduction to this new technology to help experts in both the data and telephone industries plan for the new networks.
You will learn how the telephony infrastructure was built and how it works today, the major concepts concerning voice and data networking, transmission of voice over data, and IP signaling protocols used to interwork with current telephony systems. The authors cover various benefits and applications of VoIP and how to ensure good voice quality in your network.
This book is part of the Networking Technology Series from Cisco Press, which offers networking professionals valuable information for constructing efficient networks, understanding new technologies, and building successful careers.
Asterisk: The Future of Telephony
by Jim Van Meggelen Book Description
It may be a while before Internet telephony with VoIP (Voice over Internet Protocol) reaches critical mass, but there's already tremendous movement in that direction. A lot of organizations are not only attracted to VoIP's promise of cost savings, but its ability to move data, images, and voice traffic over the same connection. Think of it: a single Internet phone call can take information sharing to a whole new level.
That's why many IT administrators and developers are actively looking to set up VoIP-based private telephone switching systems within the enterprise. The efficiency that network users can reach with it is almost mind-boggling. And cheap, if the system is built with open source software like Asterisk. There are commercial VoIP options out there, but many are expensive systems running old, complicated code on obsolete hardware. Asterisk runs on Linux and can interoperate with almost all standards-based telephony equipment. And you can program it to your liking.
Asterisk's flexibility comes at a price, however: it's not a simple system to learn, and the documentation is lacking. Asterisk: The Future of Telephony solves that problem by offering a complete roadmap for installing, configuring, and integrating Asterisk with existing phone systems. Our guide walks you through a basic dial plan step by step, and gives you enough working knowledge to set up a simple but complete system.
What you end up with is largely up to you. Asterisk embraces the concept of standards-compliance, but also gives you freedom to choose how to implement your system. Asterisk: The Future of Telephony outlines all the options, and shows you how to set up voicemail services, call conferencing, interactive voice response, call waiting, caller ID, and more. You'll also learn how Asterisk merges voice and data traffic seamlessly across disparate networks. And you won't need additional hardware. For interconnection with digital and analog telephone equipment, Asterisk supports a number of hardware devices.
Ready for the future of telephony? We'll help you hook it up.
Voice over Internet Protocol (VoIP) Security
by PhD, CISM, CISSP, James F. Ransome, PhD, CISM, John Rittinghouse Book Description
Voice Over Internet Protocol Security has been designed to help the reader fully understand, prepare for and mediate current security and QoS risks in todays complex and ever changing converged network environment and it will help you secure your VoIP network whether you are at the planning, implementation, or post-implementation phase of your VoIP infrastructure.
* This book will teach you how to plan for and implement VoIP security solutions in converged network infrastructures. Whether you have picked up this book out of curiosity or professional interest . . . it is not too late to read this book and gain a deep understanding of what needs to be done in a VoIP implementation.
* In the rush to be first to market or to implement the latest and greatest technology, many current implementations of VoIP infrastructures, both large and small, have been implemented with minimal thought to QoS and almost no thought to security and interoperability.
Putting VoIP to Work: Softswitch Network Design and Testing
by Bill Douskalis From the Back Cover
VoIP and softswitching: technical challenges, proven solutions
State-of-the-art testing techniques for ensuring superior QoS
Key design approaches for MPLS and differentiated services
Covers protocols, topologies, and call flows
By the author of the best-selling IP Telephony
The in-depth, up-to-the-minute technical guide to developing and deploying IP-based telephony.
This is a complete, in-depth technical guide to the challenges associated with building and deploying Voice over IP (VoIP) networks using softswitch technologies—and today's best solutions. Bill Douskalis, author of the best-selling IP Telephony, reviews the entire current state of the art in protocols for signaling, media transport, and network engineering—and presents expert guidance on designing telephony solutions that meet the needs of both carriers and customers.
New scenarios for design of VoIP networks based on Class 4 and Class 5 softswitch network technology
Designing for performance and interoperability: challenges, examples, and comparisons of potential solutions
Protocols of the new converged networks and design requirements for seamless integration of softswitch applications with the PSTN
Call flows for SIP, H.323, MGCP, and Megaco
Testing tips to ensure consistently high QoS in voiceband applications
MPLS and IP differentiated services in VoIP networks: key roles and integration issues Nobody has more experience implementing VoIP in large-scale networks than Bill Douskalis—and no book offers more insight for real-world VoIP design, construction, and deployment.
"The book is very well written and provides the practical information on all aspects of a VoIP network in the ever-changing field of communication technologies."
—Dr. Tushar Bhattacharjee, AT&T, Polytechnic University of New York
Taking Charge of Your VoIP Project
by John Q. Walker Book Description
Strategies and solutions for successful VoIP deployments
Justify your network investment
The step-by-step approach to VoIP deployment and management enables you to plan early and properly for successful VoIP integration with your existing systems, networks, and applications.
The detailed introduction offers a common grounding for members of both the telephony and data networking communities.
IT managers and project leaders are armed with details on building a business case for VoIP, including details of return-on-investment (ROI) analysis and justification.
A VoIP deployment is presented as a major IT project, enabling you to understand the steps involved and the required resources.
The comprehensive look at quality of service and tuning describes when and where to use them in a VoIP deployment. These are often the most complex topics in VoIP; you'll get smart recommendations on which techniques to use in various circumstances.
You learn how to plan for VoIP security, including prevention, detection, and reaction.
Voice over IP (VoIP) is the telephone system of the future. Problem is, VoIP is not yet widely deployed, so there are few skilled practitioners today. As you make your move to VoIP, how will you know how to make VoIP work and keep it working well? What changes will you need to make without disrupting your business? How can you show your return on this investment?
Many books contain technical details about VoIP, but few explain in plain language how to make it run sucessfully in an enterprise. Taking Charge of Your VoIP Project provides the detailed plans you need to be successful in your organization's deployment of VoIP. Through their years of work in the field, authors John Q. Walker and Jeffrey T. Hicks bring a project-oriented approach to VoIP, with much-needed clarity on getting VoIP to work well.
Taking Charge of Your VoIP Project starts with simple concepts, each chapter building on the knowledge from the last. Although not a technical manual, you learn about the standards, such as H.323, G.711, and Real-Time Transport Protocol (RTP), and the implications they have on your VoIP system. Most importantly, you'll gain expert advice and a systematic guide on how to make VoIP work for your organization.
This volume is in the Network Business Series offered by Cisco Press. Books in this series provide IT executives, decision makers, and networking professionals with pertinent information on today's most important technologies and business strategies.
VoIP Service Quality
by William C. Hardy Book Description
VoIP SAVINGS AND FLEXIBILITY! TELEPHONE-LINE QUALITY?
Despite the features that make Voice over IP so attractive from the standpoint of cost and flexibility of telephone services, businesses will only adopt it once they've determined whether, and under what circumstances, the quality of VoIP will be satisfactory to users. In these pages you'll find everything you need to know to answer those questions, both now and in the future as other packet-switched voice services emerge. This in-the-trenches guide supplies you with all the tools you need for VoIP service quality analysis, including explicit directions for:
- designing subjective tests and interpreting results
- selecting, extending, and applying speech distortion and multiple effects models
- examining call set-up times for IP telephony
- determining requirements for multimedia exchanges
Without hokum, hype, or obscure tech talk, Hardy delivers solid information on means of measuring, assessing, and improving VoIP quality. He gives you expert information and hands-on specifics, showing you:
- The factors that can create a negative caller experience and how packet switching affects them
- What to look for in assessing VoIP quality
- How to elicit and interpret user evaluations of voice quality
- How to estimate likely user perception of voice quality by objective test and analysis
- When and how to apply alternative quality measurement techniques to overcome quality shortfalls
Get wireline quality from VoIP service with clear guidance from a world-class expert in analysis of service quality.
Beyond VoIP Protocols
by Olivier Hersent Book Description
In 1999-2000, VoIP (Voice-over-IP) telephony was one of the most successful buzzwords of the telecom bubble era. However, in 2001-2003, VoIP faced a very tough reality check. Now, manufacturers and service providers are drawing on what they have learnt from past experience in order to prepare to participate in the next major challenge faced by the telecommunications industry. This book offers a comprehensive overview of the issues to solve in order to deploy global revenue-generating effective "multimedia" services. Drawing on extensive research and practical deployment experience in VoIP, the authors provide essential advice for those seeking to design and implement a post-bubble VoIP network. Beyond VoIP Protocols: Understanding Voice Technology and Networking Techniques for IP Telephony Introduces the basics of speech coding and voice quality Demonstrates how quality of service may be built into the network and deals with dimensioning aspects, e.g. multipoint communications and how to model call seizures. Explores the potential of multicast to turn an IP backbone into an optimized broadcast medium Includes amply illustrated, state-of-the-art practical advice for formulating a complete deployment strategy A companion volume to "IP Telephony: Deploying VoIP Protocols", this book takes the reader a stage deeper into how to prepare the network and exploit VoIP technology to its full potential.
by Frank Ohrtman Book Description
Bypassing the old circuit-switched hardware, softswitches streamline message traffic and provide a much more efficient service development environment. Along with SIP, this technology leverages Internet technologies to replace plain-old-telephone service. Developers who are freed up by softswitch technology to build cost-effective 3G serives will learn how it works and what applications it can support. Network managers making hard decisions about whether to deploy VoIP will learn pros and cons, costs and benefits, and most importantly how to separate myth from reality.
Internet Communications using SIP
by Henry Sinnreich Book Description
The book will be significantly revised to reflect standards, services and vendor products which have developed since the first edition, including innovation such as SIP usage beyond VoIP: Presence, IM, mobility, etc.
SIP essentials are presented with deployment and integration examples at every step to highlight the basics regarding functionality in a network. The main chapters deal with new services enabled by SIP and how they relate to using Internet protocols to their full potential. Pointers to relevant Internet standards drafts are provided for those who want the exact specifications of the SIP protocol and its related functional extensions.
IP Telephony - The Integration of Robust VoIP Services
by Bill Douskalis From the Inside Flap Introduction:
In the last five years of the twentieth century, we have seen developments in the telephone network which will affect our lives well into the new millennium. A continuing and massive effort by the industry is bringing closer the day when integrated services and multimedia will finally come to our homes-on demand and at affordable prices. The Plain Old Telephone Service, POTS as it has been known for most of the twentieth century, is giving way to modernization, service integration, and convergence of two fundamentally different types of technologies: voice and data.
There is nothing wrong with the quality of the Public Switched Telephone Network, the PSTN as we have known it for so many years, either in the delivered speech quality or in its reliability. On the contrary, it is the model of robustness and security, and those of us who know its intricate details are amazed by how something this large and this complex can function so reliably and so well. But the quality of a telephone conversation seems to have given way to other, higher priorities and is no longer the only driving factor for modernizing the network. Changing needs in both the business and residential market segments require new telephony features and capabilities that are neither simple nor economical for service providers to create on top of the PSTN infrastructure. This contrasts the current fact of life of the telephone companies, which are approaching the point of not being able to produce a single new feature in their present networks without substantial expenditures and delays. Service and feature creation on standard Class 5 service platforms became simply an intractable and very expensive proposition. So, when the requirements of the market aligned with the needs of the service providers, it was only a matter of a short time before it became obvious the PSTN had to be transformed and modernized, not in an evolutionary manner but in a revolutionary manner. But is the new PSTN that is coming our way going to be better? And who defines what better is? And who will pay for all this modernization? There are both simple and complex answers for these three questions.
by Ted WallingfordBook Description:
Voice over Internet Protocol (VoIP) is gaining a lot of attention these days, as more companies and individuals switch from standard telephone service to phone service via the Internet. The reason is simple: A single network to carry voice and data is easier to scale, maintain, and administer. As an added bonus, it's also cheaper, because VoIP is free of the endless government regulations and tariffs imposed upon phone companies.
VoIP is simply overflowing with hack potential, and VoIP Hacks is the practical guide from O'Reilly that presents these possibilities to you. It provides dozens of hands-on projects for building a VoIP network, showing you how to tweak and customize a multitude of exciting things to get the job done. Along the way, you'll also learn which standards and practices work best for your particular environment. Among the quick and clever solutions showcased in the book are those for:
- gauging VoIP readiness on an enterprise network
- using SIP, H.323, and other signaling specifications
- providing low-layer security in a VoIP environment
- employing IP hardphones, analog telephone adapters, and softPBX servers
- dealing with and avoiding the most common VoIP deployment mistakes
In reality, VoIP Hacks contains only a small subset of VoIP knowledge-enough to serve as an introduction to the world of VoIP and teach you how to use it to save money, be more productive, or just impress your friends. If you love to tinker and optimize, this is the one technology, and the one book, you must investigate.
Practical VoIP Security
by Thomas Porter, Jan Kanclirz Jr.Book Description: Your Hands-On Guide to Voice over IP (VoIP)
This book was written for the thousands of IT professionals-from CIOs to circuit-switched telecom engineers-who are now responsible for deploying and maintaining secure VoIP networks. The book explains the impact on your VoIP network of PSTN, SIP, H.323, firewalls, NAT, encryption, and the regulatory environment. Coverage includes evaluation, design, integration, and management of VoIP networking components, including IP telephones, gateways, gatekeepers, registration servers, media servers, and proxy servers. Throughout the book, the authors rely on their extensive real-world experience to provide readers with practical applications and solutions.
- VoIP Isn't Just Another Data Protocol IP telephony uses the Internet architecture, similar to any other data application. However, from a security administrator's point of view, VoIP is different. Understand why.
- What Functionality Is Gained, Degraded, or Enhanced on a VoIP Network? Find out the issues associated with quality of service, emergency 911 service, and the major benefits of VoIP.
- The Security Considerations of Voice Messaging Learn about the types of security attacks you need to protect against within your voice messaging system.
- VoIP and the Public Switched Telephone Network (PSTN) Understand PSTN: what is it, and how does it work?
- VoIP Communication Architectures See how products like Skype, H.248, IAX, and Microsoft Live Communications Server 2005
- The Support Protocols of VoIP Environments Learn the services, features, and security implications of DNS, TFTP, HTTP, SNMP, DHCP, RSVP, SDP, and SKINNY.
- Securing the Whole VoIP Infrastructure Your guide to Denial-of-Service attacks, VoIP service disruption, call hijacking and interception, H.323-specific attacks, and SIP-specific attacks.
- Authorized Access Begins with Authentication Learn the methods of verifying both the user identity and the device identity in order to secure a VoIP network.
- Secure Internet Mail See how S/MIME provides cryptographic security services for electronic messaging applications.
SIP Beyond VoIP
by Henry Sinnreich, Alan B. Johnston, Robert J. Sparks, Vinton G. CerfBook Description:
VON Publishing's latest effort is SIP Beyond VoIP, an extraordinary 333-page effort that picks up where previous books have left off about SIP (Session Initiation Protocol), the protocol that has revolutionized the world of VoIP. The book's three distinguished authors relate in great detail how this versatile and extensible protocol has truly moved beyond VoIP and is now starting to have an impact on the whole telecommunication industry, including wireless and enterprise communications.
Anyone who thinks that SIP has any real competitors will come away from this book in astonishment. SIP-Events are the glue that even now integrates communications and applications. And SIP-Presence may well be the dial tone of the 21st century.
The book's advanced discussion of SIP interleaves with such associated topics as DNS (the Domain Name Service), ENUM (electronic numbering), NAT (Network Address Translation) and firewall traversal, security, Peer-to-Peer SIP (P2P SIP) networks, SIP-based conferencing/collaboration and even accessibility to communications for disabled people.
This heavily illustrated, footnoted and fully-indexed book also has a foreword by Vinton Cerf, who writes: It is my honest opinion that we have barely scratched the surface of the various applications to which SIP may be adapted. If we have seen 1% of the applications of SIP so far, then there are still 99% waiting to be invented, developed or deployed. The generality of SIP will make it a major workhorse the Internet of this century.
If you think you know SIP, think again. Get this book, its authors will set you straight about SIP, once and for all!
Practical VoIP Using VOCAL
by Luan Dang, Cullen Jennings, David G KellyBook Description:
While many books describe the theory behind Voice over IP, only Practical VoIP Using VOCAL describes how such a phone system was actually built, and how you too can acquire the source code, install it onto a system, connect phones, and make calls.
VOCAL (the Vovida Open Communication Application Library) is an open source software project that provides call control, routing, media, policy, billing information and provisioning on a system that can range from a single box in a lab with a few test phones to a large, multi-host carrier grade network supporting hundreds of thousands of users. VOCAL is freely available from the Cisco Systems-sponsored Vovida.org community web site (http://www.vovida.org/
A Silicon Valley start-up called Vovida Networks, Inc (think of VOice, VIdeo, DAta) created VOCAL and invested over one hundred man years into its development. Since Cisco acquired Vovida in 2000, individuals representing every significant telecom company and service provider in the world have downloaded the source code. Today, more and more people are successfully building VOCAL into professional solutions, while contributing fixes and new functionality back to Vovida.org.
Because VOCAL is open source, you can look "under the hood" to the base code and protocol stack levels and discover not only how the system works, but also how common problems are being worked out in the development environment. We're hoping that you will be inspired to take this system to another level by implementing a feature or functionality that no one has thought of before.
Written by a team from Vovida Networks, Practical VoIP Using VOCAL includes the following topics:
- Installing and configuring VOCAL 1.4.0 onto a single host and onto a multi-host network with phones and gateways
- C++, C and Java architecture found within VOCAL
- Provisioning a VoIP system
- SIP (Session Initiation Protocol), SDP (Session Description Protocol) and RTP (Real-time Transport Protocol) for call control and media
- TRIP (Telephony Routing over IP), DNS SRV and ENUM for routing
- MGCP (Media Gateway Control Protocol) and H.323 for call control and translation into SIP
- COPS (Common Open Policy Service), OSP (Open Settlement Protocol) and RSVP (Reservation Protocol) for policy and Quality of Service
- RADIUS (Remote Authentication Dial In User Service) for interfacing with billing servers
- SNMP (Simple Network Management Protocol)
If you're interested in VoIP, this is the only book available that focuses on the real issues facing programmers and administrators who need to work with these technologies. Book Info
Shows programmers and administrators how to implement, program, and administer VoIP systems using open source tools instead. Provides background and real-world examples for provisioning and administering VoIP systems. Softcover.
VoIP Made Easy
by Bill StuckeyAbout the Author
Bill Stuckey graduated from the University of Arkansas in 1976 with a degree in Industrial Engineering. He began his career as a systems engineer for IBMâ€™s mainframe division and has remained in the technology arena ever since. After leaving IBM, he became an assistant professor in computer science with Arkansas Tech University and went on to own and operate several technology-oriented businesses. Bill is the president of Newroads Telecom, a regional Competitive Local Exchange Carrier (CLEC) that provides both voice and high-speed data communications services in Arkansas and Oklahoma. He and his wife Debbie live in Fort Smith, Arkansas where they have raised their three children.
Internet Communications Using SIP
by Henry Sinnreich, Alan B. JohnstonBook Description
From leading WorldCom engineers--expert guidance on how to plan for SIP implementation Session Initiation Protocol (SIP) has gained tremendous market acceptance since it became an official IETF Internet communications standard in 1999. SIP is the technology that makes it possible for multimedia communications sessions on the Web--ones that allow voice, video, chat, interactive games, and others to run all at the same time. Now that the deployment of real SIP networks is about to take off, two leaders of the commercial rollout deliver complete guidance on this exciting new technology. Geared to IT and networking professionals and decision-makers at Internet service providers (ISPs), as well as networking (NSPs) and application (ASPs) service providers, this book helps readers sort through the available vendor offerings and services to discover how to integrate and maximize SIP's power across their networks.
Voice Over IPv6
by Daniel MinoliBook Description
IPv6 (Internet Protocol version 6) is the future of internet telephony. And this book is your guide to that future.
IPv6 is the replacement for the currently used IPv4 (Internet Protocol version 4). IPv6 will offer increased IP addresses (full 128-bit addresses, compared to the 32-bit addresses of IPv4), enhanced security, and greater robustness. It will also be fully backwards compatible with existing IPv4 systems. These capabilities will finally make internet telephony a viable competitor to conventional switched telephone networks. In this book, Dan Minoli clearly explains IPv6 and how telephone networks can be built on its foundations.
This is not just another IPv6 book; instead, it focuses on those aspects of IPv6 relevant to internet telephony systems and voice networks. Minoli uses a compare/contrast approach, exploring where IPv6 is similar to IPv4 and where it differs, to let you quickly grasp the essence of IPv6 and the similarities (and differences) between current IPv4-based systems and IPv6-based systems.
If you will be designing, implementing, or maintaining the next generation of internet telephony systems, then you need the information in this book!
*Explains the essential concepts of IPv6 and how they relate to internet telephony
*Describes how internet telephony systems using IPv6 are different fromand better thaninternet telephony systems based on the older IPv4 standard
*Discusses how to transition existing IPv4 internet telephony systems and conventional switched systems to IPv6-based systems
*Extensive treatment of security issues, including IP layer encryption and authentication methods
*Explains connection techniquesincluding plug and play approachesfor equipment used in IPv6 systems
* The first title describing how the next generation internet protocolIPv6can be used for internet telephony.
* Explains IPv6 as it applies to internet telephony (VoIP)
* Shows how IPv6 gives better security, QoS, and signal integrity in internet telephony
VoIP Telephony with Asterisk
by Paul MahlerBook Description
VoIP Telephony with Asterisk is the best-selling introduction to the leading open source PBX software. You'll learn how to provision telephony, install and compile Linux and Asterisk, and configure an Asterisk dial plan for both analog and SIP telephones. The book's 300 pages cover Cisco and snom telephones, Digium boards, faxing, voicemail, basic IVR and a variety of related topics. About the Author
Paul Mahler is founder and Chief Technical Officer of Signate, a leading global provider of technical services for Asterisk and VoIP telephony, as well as the author of VoIP Telephony with Asterisk, the first comprehensive guide to Asterisk.
A specialist for three decades in the architecture and implementation of mission-critical business systems, Mahler's experience encompasses telephony, relational databases, and UML and model driven architectures. His clients have included Air Touch, AT&T, Pacific Bell, Verizon and Visa. He began his career as the founder of Horizon Software systems, the first software applications developer for the UNIX operating system.
He is the author of four other technical books on computer languages, relational database theory and practice, programming environments, and client-server technology. He has published a wide variety of computer articles, manuals and technical briefs.
Mahler has a BA, at honors, from the University of California at Berkeley in Philosophy of Science. He completed four years in the Ph.D. program of Bio-physics at U.C. Berkeley and the graduate program of Medical Information Sciences at U.C. San Francisco.
Building a Voip Network with Nortel's Multimedia Communication Server 5100
by Larry Chafflin Book Description
This is the only book you need if you are tasked with designing, installing, configuring, and troubleshooting a converged network built with Nortel's Multimedia Concentration Server 5100, and Multimedia Communications Portfolio (MCP) products. With this book, you'll be able to design, build, secure, and maintaining a cutting-edge converged network to satisfy all of your business requirements.
This book begins with a discussion of the current protocols used for transmitting converged data over IP as well as an overview of Nortel's hardware and software solutions for converged networks. In this section, readers will learn how H.323 allows dissimilar communication devices to communicate with each other, and how SIP (Session Initiation Protocol) is used to establish, modify, and terminate multimedia sessions including VOIP telephone calls. The next sections introduce the reader to the Multimedia Concentration Server 5100, and Nortel's entire suite of Multimedia Communications Portfolio (MCP) products. The following chapters of the book teach the reader how to design, install, configure, and troubleshoot the entire Nortel product line including coverage of i2004 IP Phones, PC Client, Personal Agent, Call Pilot, and Meet Me. The next section of the book details advanced and configurations and troubleshooting scenarios including wireless deployments. In the final chapter, you will learn to secure your entire multimedia network from malicious attacks.
Cut the Cord! The Consumer's Guide to VoIP
by Jerri L. Ledford Book Description
Telephones have truly become an integral part of our daily lives, serving as our communication lifeline to the world. However, there have been very few advances in the basic technology of phone service - until now. Voice over Internet Protocol (VoIP) offers consumers a cost-effective alternative to traditional phone service. "Cut the Cord! The Consumer's Guide to VoIP" gives you the knowledge you need to decide if VoIP is right for you. It offers tips for selecting a VoIP service and advice for setting up your new service. It is packed with checklists, Web site resources, tips, and notes, and even provides examples of services that you can try before committing to VoIP.