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For the first
time in a century,
a structural revolution
is redefining
voice telephone
technology. Reinventing
Telephony: The
Voice Over IP
Revolution provides
a concise, penetrating
view of the technologies
and policy issues
that are driving
this sea change,
and emphasizing
the core technologies
that will make
it practical.
This short course
is designed to
appeal to a wide
range of people
interested in
the revolution
that is overtaking
the traditional
telephone industry.
It provides a
non-threatening
view of the numerous
technologies and
components that
are emerging as
core features
of this important
new way of communicating.
Technical personnel,
marketing staff
and business decision-makers
would all benefit
from this clear,
concept-level
presentation of
the issues that
are driving this
revolution.
The first three
sections develop
vocabulary and
familiarity with
current telephony
technologies and
practices, and
the existing models
for wide area
data networking.
The next key
topic is the Internet
phenomenon; its
protocols, extensions
and limitations
as they apply
to supporting
voice service.
Included here
is a concept-level
treatment of packet
delay and Quality
of Service issues
-- the principal
obstacles to adopting
Voice Over IP.
A last two topics
are:
the technical
concepts of signaling;
the conventional
public telephone
network approach
and emerging approaches
using IP
essential business
issues; revenue
models and competitive
pressures that
are influencing
the market
(i) Telephony
As It Has Always
Been Defined
The Analog Bandwidth
Concept
Analog and Digital
Components
Traditional Media;
UTP, Fiber Optics,
Microwave ...
The Multiplexed,
Channelized Infrastructure
The Current Convergence
Model: IP/ATM/SONET/WDM
(ii) Digitizing
Voice
Pulse Code Modulation
The ISDN Model
For Voice
DSP-based Vocoding
Techniques
Compelling Advantages
of Vocoding vs.
PCM
(iii) Switching;
Circuit and Packet
Approaches
The Circuit Switched
Infrastructure
The Public Switched
Telephone Network:
The 10,000 ft.
View
Concept Features
of Packet Switching
Connection-Oriented
vs. Connectionless
Packet Communication
(iv) Primer:
The Internet Computing
Architecture
Elements of the
ICA
Next Generation
Features and Opportunities
Real-Time Extensions
Applied to Voice
Over IP
Quality of Service
Issues
(v) Voice
and Packet Switching
Compelling Advantages
of Packet vs.
Circuit Switching
Common Features;
Voice Over Packet
Packet Delay,
Packet Size and
Network Delay
Factors
Mobile IP; A Role
For Voice?
(vi) Signaling;
Why We need It
and What It Does
Signaling in the
PSTN; What Makes
The Phone Ring
Centralized vs.
Distributed Approaches
In-Band, Out-Of-Band
and Common Channel
Signaling
Making the The
IP Phone Connection
(vii)
Call Control Protocols
and Configurations
Comparison of
Call Control Protocols
H.323, SIP, MGCP
and Megaco
Service Provider
Configurations
Roles of Gateways, Softswitches and Servers
(viii)
Business Issues
Traditional Telephony
Revenue Models
Emerging Revenue
Models
End-User Advantages
Service Provider
Advantages
The Effect of
Competition on
Network Evolution
Appendices
Glossary
of Terminology
Suggestions For
Further Reading
General
Index
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