| Date: 19 January 2011, 08:31
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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
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 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:
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 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.
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This site does not store Switching to VoIP on its server. We only index and link to Switching to VoIP provided by other sites. Please contact the content providers to delete Switching to VoIP if any and email us, we'll remove relevant links or contents immediately.
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