Voice over IP Fundamentals
Product Description
A systematic approach to understanding the basics of voice over IP Understand the basics of enterprise and public telephony networking, IP networking, and how voice is transported over IP networks Learn the various caveats of converging voice and data networks Examine the basic VoIP signaling protocols (H.323, MGCP/H.248, SIP) and primary legacy voice signaling protocols (ISDN, C7/SS7) Explore 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, QoS tools, and security Voice over IP (VoIP) has become an important factor in network communications, promising lower operational costs, greater flexibility, and a variety of enhanced applications. To help you understand VoIP networks, Voice over IP Fundamentals provides a thorough introduction to the basics of VoIP. Voice over IP Fundamentals explains how … More >>
February 18th, 2010 at 10:47 pm
Fragmentation is necessary because of the time it takes to output bits in large frames on slow serial links. This time is called serialization delay and it is relevant for low-speed interfaces where delay-sensitive voice packets might need to wait a long time while a long frame is pushed out the interface, at say, 64 Kbps. Propagation delay is not the issue. This seems like a very basic telecommunications 101 issue that the authors should not have gotten wrong.
Rating: 2 / 5
February 18th, 2010 at 11:44 pm
From page 168, “serialization delay is not covered because its influence on delay is relatively minimal.” Why do the authors think we need fragmentation? They seem to think it’s needed because of propagation delay. I don’t think the authors understand “Voice over IP Fundamentals.”
Rating: 1 / 5
February 19th, 2010 at 1:56 am
This book is just another ‘must have’ book for network engineers. It’s not a ‘cook book’ for VoIP. It’s a ‘ICRC’ book for the guys like me who knows TCP/IP but not SS7. More over, it should be on the shelf of CCIE candidates.
Rating: 4 / 5
February 19th, 2010 at 3:55 am
With companies like Vonage beginning to advertise for broad based end user sales on television, VoIP must have become of age. I do notice, however, that Vonage still charges by the minute. I guess they think that this is what customers are used to paying so why not.
This book is aimed not at the Vonage type end user, but at the technically savvy individual. It aimed at three types: people who know circuit switching and want to know more about packet switching, people who know packet switching and want to know more about circuit switching, computer types who know computers but are not expert in communications.
It starts with how the traditional phone system worked and then moves to explain the difference between the old circuit switched system that Ma-Bell developed to the newer packet switched systems of today.
Most of the equipment being discussed is Cisco, as is fitting because it seems that they have just about the most complete line, and because this book is put out by Cisco Press. This is a resonably high level book, it is not intended for the absolute beginner who wants to use VOIP, but at the person who wants to understand the underlying technology. You’ll learns lots of new With companies like Vonage beginning to advertise for broad based end user sales on television, VoIP must have become of age. I do notice, however, that Vonage still charges by the minute. I guess they think that this is what customers are used to paying so why not.
This book is aimed not at the Vonage type end user, but at the building of a comprehensive understanding of VoIP and would appeal to the sophisticated home user and to the corporate network engineer charged with moving his company to VoIP. It starts with how the traditional phone system worked and then moves to explain the difference between the old circuit switched system that Ma-Bell developed to the newer packet switched systems of today.
Most of the equipment being discussed is Cisco, as is fitting because it seems that they have just about the most complete line, and because this book is put out by Cisco Press. This is a fairly advanced book. It is not intended for the person who wants to set up a system, but for the person who wants to understand the underlying technology. You’ll learn lots of new algorithms.
Rating: 5 / 5
February 19th, 2010 at 4:23 am
Very well written. I am learning quite a bit about VoIP. Highly recommend it.
Rating: 5 / 5