Ebook Switching to VoIP, by Theodore Wallingford
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Switching to VoIP, by Theodore Wallingford
Ebook Switching to VoIP, by Theodore Wallingford
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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 and data 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 to 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 empowersbusinesses 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 of the 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'lldiscover 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
- scalability
- standards-compliance
- 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, IPTables 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:
- SIP
- H.323, SCCP, and IAX
- Voice codecs
- 802.3af
- 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.
- Sales Rank: #1027956 in Books
- Brand: Wallingford, Ted
- Published on: 2005-07-10
- Released on: 2005-07-07
- Original language: English
- Number of items: 1
- Dimensions: 9.19" h x 1.10" w x 7.00" l, 1.70 pounds
- Binding: Paperback
- 504 pages
- ISBN13: 9780596008680
- Condition: New
- Notes: BRAND NEW FROM PUBLISHER! 100% Satisfaction Guarantee. Tracking provided on most orders. Buy with Confidence! Millions of books sold!
About the Author
Born and raised in Detroit, MI, Ted Wallingford began working with information systems at the age of 7, when his father brought home a used Timex Sinclair 1000 computer and a notepad of hand-written BASIC programs from a garage sale. This little machine was the start of an eclectic career in the business of bits and bytes.While working in the data center at ad agency J. Walter Thompson, Ted began to write articles for computer magazines. This led him into writing marketing materials for Gateway Computer and the former Amiga Inc., where he was also webmaster in 1999. As I.T. Director for a large, private construction firm, Ted transformed a single-operator midrange computer room into a mission-critical 24x7 data center hosting services for lines of business across the country. Ted has designed and implemented Voice over IP on networks large and small. He offers network design for VoIP systems and product management assistance for up'n'coming VoIP carriers through his macVoIP.com consulting practice. Ted believes that VoIP and the Internet are today's revolution in distance communication.Aside from technology and writing, Ted has served as a member of the board of trustees for an international adoption agency in suburban Cleveland, where he lives with his wife and two children. Ted is currently working on Switching to VoIP for O'Reilly Media.
Most helpful customer reviews
19 of 20 people found the following review helpful.
Good choice for investigating VoIP for your organization...
By Thomas Duff
It seems like Voice over Internet Protocol, aka VoIP, is starting to become much more mainstream. Not only are businesses switching over, but now you can set up your home phone access to use VoIP (aka "broadband") technology. Ted Wallingford has done a nice job in explaining the business side of the possibilities in the book Switching to VoIP - A Solutions Manual for Network Professionals.
Contents: Voice and Data - Two Separate Worlds?; Voice over Data - Many Conversations, One Network; Linux as a PBX; Circuit-Switched Telephony; Enterprise Telephone Applications; Replacing the Voice Circuit with VoIP; Replacing Call Signaling with VoIP; VoIP Readiness; Quality of Service; Security and Monitoring; Troubleshooting Tools; PSTN Trunks; Network Infrastructure for VoIP; Traditional Apps on the Converged Network; What Can Go Wrong?; VoIP Vendors and Services; Asterisk Reference; SIP Methods and Responses; AGI Commands; Asterisk Manager Socket API Syntax; Glossary; Index
I think the biggest thing to keep in mind when approaching this book is the target audience. While there are a few books out there on "internet telephones" that talk to the consumer, this isn't one of them. The tag line of "for Network Professionals" is the key here. While you don't have to be a network guru to read this book, some level of familiarity with network and telephony concepts would help. Someone either working with the communication systems in a company or heading up a communications department would be a perfect match here. You'd probably even do alright if you just have an interest in the subject, as Wellingford does a good job taking what can be complex material and making it understandable. An admirable task in itself...
What makes this book stand out from other books I'd expect to see is that it doesn't just dwell on jargon and theory. There are a number of projects included in the book so you can get your hands dirty actually working with the technology. Add to that the fact that the author uses an open source PBX system called Asterisk for the exercises. So now you have no reason in terms of cost for not diving right in.
Although I'm not necessarily the target audience for this book, I'd have no problem recommending it to someone looking for material that covers this subject. The book is very well written, and after finishing it you should have a very firm grasp of the essentials. You might even know enough to start yourself on your next career path... :)
18 of 19 people found the following review helpful.
Pretty Good
By Darin Rand
As the telcom manager for a rather large enterprise (45,000 users) I try to keep up on the various books on VoIP and this one is pretty good. It is designed towards someone who is knowledgeable about voice and data but not necessarily someone how is an expert in either subject. It also does a very good job of not focusing on any one type of technology but covers H.323, SIP and Cisco amongst many others and gives you a good sense of each flavor that is available. I would recommend it for anyone looking to deploy VoIP.
3 of 3 people found the following review helpful.
Excellent Guide for a VoIP Migration Project
By W. Sears
I enjoyed this book a lot and also read Cisco Press's "Taking Charge of Your VoIP Project" by Walker and Hicks.
Here's my frame of reference on reading and reviewing this book. I am a sys admin at a 75-person company, and I am generalist (Windows servers and desktops, LAN/WAN/wireless, switches/routers/firewalls, VPN, security, training, helpdesk, and phones). This book was targeted at someone like me, who has a networking background but little phone background. We have a full-featured TeleVantage phone system that runs on a Windows server with a 24-channel T1 line to the phone company. I know enough about it to run our phone system, but I don't know much about the underlying telephone technology.
I am considering upgrading to VoIP, because my PCI phone cards (T1 card and telephone station cards) in my phone server are old and no longer supported by new versions of TeleVantage. However, TeleVantage supports VoIP, so all I would have to do is remove the PCI cards and instead use my WAN connection to the outside world and my LAN as my connection to my phones.
This book does a good job explaining traditional telephone technology and then VoIP. The author wrote the open-source VoIP software called Asterisk, so he can speak authoritatively to VoIP. If you are so inclined, you can follow his labs (Projects) throughout the books and build your own VoIP system on Linux and Asterisk. I felt the book had the right level of technical depth for someone of my background.
I thought he also does a good job making a project of moving to VoIP very practical in a business setting. He covers things like current infrastructure assessment, design, doing a migration in chunks, how to minimize user impact, selecting a VAR (value added reseller) and measuring up-front cost and ROI.
Finally, I appreciated his objective perspective on the public telephone network and PBX vs. VoIP, that both have their advantages and disadvantages, and that while implementing and supporting VoIP can be complex, it can be achieved successfully if be done correctly.
My take-away is that I gained a general understanding of how the public phone system works from the point of view of my business, and I now generally understand how VoIP works. I can now speak somewhat intelligently and generally ask the right questions of my TeleVantage software provider and when selecting a SIP provider.
Am I comfortable starting my VoIP migration project based on these two books? Yes. I still have a lot to learn and will make some mistakes, but at least I understand generally where to start and how to proceed.
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