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From Barnes & NobleThe Barnes & Noble Review
Once, deploying new telecom services was a highly-specialized, complex, painful process best left to a few carrier-class switch providers and a few large service providers. Suddenly, thanks to deregulation, there are thousands of service providers. And thanks to VoIP, service providers can leverage the power and ubiquity of the Internet to deploy virtually any imaginable service — faster, and at lower cost. It's a revolution — and with Voice Over Ip Fundamentals from Cisco Press, you can get in on it.
Written for both data and voice networking professionals — even those without lengthy experience — the book covers all you'll need to know to get started. The authors start by demystifying the existing Public Switched Telephone Network (PSTN), including key elements such as SS7 — and showing why it isn't meeting the needs of a data-centric world. Next, they introduce VoIP, explaining how it can run the same applications as the PSTN, but more cost-effectively and with greater scalability. You'll review the functional components of a VoIP solution, and how they fit together. There are also candid discussions of the serious challenges associated with implementing VoIP, including jitter, packet loss, latency, and quality of service.
Next, the authors focus on the key protocols associated with VoIP, including H.323 for videoconferencing, SIP, gateway control protocols, and how Cisco's Virtual Switch Controller (VSC) wraps them all together. You walk through setting up calls, tearing down calls, and offering services — the bread-and-butter ofanytelephony network.
Some important VoIP standards are still in flux, and this book certainly takes a Cisco-centric view of the world. But those are two small caveats for an excellent introduction to VoIP that will serve most technical professionals extremely well.