推荐VOIP经典图书: carrier grade voice over IP (2nd edition)

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【资料原名】：carrier grade voice over IP (2nd edition
【资料作者】：Daneil Collins
【资料日期】：2004
【资料语言】：英文
【资料格式】：PDF
【资料目录和简介】：
The two terms that make up the title of this book, “carrier-grade” and “Voice
over IP (VoIP),” mean many things to many people, and each term may have
several meanings depending on the context. Furthermore, many people
might consider the two terms to be mutually exclusive, making the phase
carrier-grade VoIP an oxymoron. That used to be the case, but those days
are over. The excitement that VoIP has generated and the resources that
have been applied to developing technical solutions for VoIP have allowed
it to become a serious alternative for voice communications. That is,VoIP is
a serious alternative to the circuit-switched telephony that we have known
for decades. Not only can VoIP technology now offer straightforward telephony
services, but it can offer a lot more besides, and it can do it with the
same quality of service (QoS) that we have become familiar with in traditional
telephony.
The overall objectives of this book are to examine the technical solutions
that make VoIP a reality and to illustrate how today’s VoIP solutions can
offer everything that traditional circuit switching provides, plus a lot more.
This first chapter introduces the reader to VoIP in general and looks at
some of the reasons why it is such a hot topic. Thereafter, a brief overview
of technical challenges and solutions is presented. This chapter can be considered
a glimpse of the topics that are covered in more depth in later chapters.
Firstly, however, we need to understand what exactly is meant when
we talk about terms such as VoIP and carrier-grade.