Delivering Voice over IP Networks
Chapter One
Introduction and
Motivation
1.1 Introduction
Data networks have progressed to the point that it is now possible to support voice
and multimedia applications right over the corporate enterprise network and the
intranet, for both on-net and off-net applications. Many companies have already
deployed IP-based backbones that provide both broadband capabilities and Quality
of Service (QoS)-enabled communications. Some companies have deployed
Asynchronous Transfer Mode (ATM) networks. Switching technology, particularly
in terms of the switched local area network (LAN), has gone a long way in the past
five years, providing higher-capacity, lower-contention services across the enterprise
campus network. High-speed wide area technology, such as Packet over Synchronous
(POS) Optical Network and metro optical services as metro gigabit
Ethernet, provide increased bandwidth across the enterprise regional, nationwide,
and international networks.
The Internet Engineering Task Force (IETF) Mul ... read full excerpt from Delivering Voice over IP Networks, 2nd Edition ebook
