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Recommended VOIP books:
VoIP Telephony with Asterisk
by Paul Mahler
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.
Softswitch : Architecture for VoIP (Professional Telecom)
by Frank Ohrtman , Frank Ohrtman
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.
Introduction to IP Telephony : Why and How Companies are Upgrading Private Telephone Systems to use VoIP Services [DOWNLOAD: PDF]
by Lawrence Harte
This "Introduction to IP Telephony" book explains why companies are converting some or all of their telephone systems from dedicated telephone systems (such as PBX) to more standard IP telephony systems. These conversions allow for telephone bill cost reduction, increased ability to control telephone services, and the addition of new telephone information services. By upgrading their systems, companies can immediately reduce their telecommunication costs 40% to 70%. Because IP telephony systems allow the end user and system administrators to setup and disconnect telephone numbers and services, this provides increased control over their telephone features and services. IP telephony is usually based on standard data formats (Internet Protocol). This permits information systems (such as product catalog information) to be more easily linked to the telephone system, thus providing the ability for companies to increase sales through interactive telephone and Internet order processing systems. You will learn that not all voice over data IP telephony systems and services are the same. There are cost and quality tradeoffs along with common problem areas and risks. There are many ways these systems can reduce telecommunication costs along with the ability to create new revenue producing services. You will understand how you can get better than telephone toll quality audio, how to maintain or increase system reliability, and new ways to use intelligent telephone systems to increase company revenues. You will learn how employees can keep their phone numbers and existing equipment (using adapters) and call anywhere in the world using IP telephony services.
Taking Charge of Your VoIP Project
by John Q. Walker , Jeffrey T. Hicks
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?
Practical VoIP Using VOCAL
by David G. Kelly , Cullen Jennings , Luan Dang
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 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 (www.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. You can take this system to another level by implementing a feature or functionality that no one's thought of before.
Putting VoIP to Work: Softswitch Network Design and Testing
by Bill Douskalis
Presents the protocols and topologies necessary to build a voice over IP (VoIP) network using softswitch tecnologies. The book's approach places the current state of the art in signaling and media transport on top of a reference topology that requires a multitude of specifications to be correctly implemented in order to function properly. In this context, the author discusses call flows, conferencing, interfacing with the PSTN, and replication of existing intelligent network features and services.
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.
IP Telephony - The Integration of Robust VoIP Services
by Bill Douskalis
Compiles the best-known answers and solutions for delivering Voice Over IP (VoIP) services with the quality customer demand. Covers the combined issues of protocol signaling, media transport methodology, reference topological considerations, and voice quality testing in service offerings. CD-ROM included.
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.
VoIP Service Quality
by William C. Hardy
VoIP (Voice over Internet Protocol), the next big advance in telecom, has proven difficult to implement. This resource gives service and enterprise telecom managers all the data they need on measurements, tools, and utilities to build a Voice over IP service that works as well as the telephone.