VoIP For Dummies
by Timothy V. Kelly, Don Peterson
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
More and more businesses today have their receive phone servicethrough Internet instead of local phone company lines. Manybusinesses are also using their internal local and wide-areanetwork infrastructure to replace legacy enterprise telephonenetworks. This migration to a single network carrying voice anddata is called convergence, and it's revolutionizing the world oftelecommunications by slashing costs and empowering users. Thetechnology of families driving this convergence is called VoIP, orVoice over IP.
VoIP has advanced Internet-based telephony a viable solution,piquing the interest of companies small and large. The primaryreason for migrating to VoIP is cost, as it equalizes the costs oflong distance calls, local calls, and e-mails to fractions of apenny per use. But the real enterprise turn-on is how VoIP empowersbusinesses to mold and customize telecom and datacom solutionsusing a single, cohesive networking platform. These businessdrivers are so compelling that legacy telephony is going the way ofthe dinosaur, yielding to Voice over IP as the dominant enterprisecommunications paradigm.
Developed from real-world experience by a senior developer,O'Reilly's Switching to VoIP provides solutions for the mostcommon VoIP migration challenges. So if you're a networkprofessional who is migrating from a traditional telephony systemto a modern, feature-rich network, this book is a must-have. You'lldiscover the strengths and weaknesses of circuit-switched andpacket-switched networks, how VoIP systems impact networkinfrastructure, as well as solutions for common challenges involvedwith IP voice migrations. Among the challenges discussed andprojects 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 toVoIP uses a combination of strategy and hands-on "how-to" thatintroduce VoIP routers and media gateways, various makes of IPtelephone equipment, legacy analog phones, IPTables and Linuxfirewalls, and the Asterisk open source PBX software by Digium.You'll learn how to build an IP-based or legacy-compatible phonesystem and voicemail system complete with e-mail integration whilebecoming familiar with VoIP protocols and devices. Switching toVoIP remains vendor-neutral and advocates standards, notbrands. 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 Switchingto VoIP will help you build your own system, install it, and beginmaking calls. It's the only thing left between you and a moderntelecom network.
Voice over IP Fundamentals
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.