A systematic approach to understanding the basics of voice over IP

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 a basic IP telephony infrastructure is built and works today, major concepts concerning voice and data networking, and transmission of voice over data networks. You'll learn how voice is signaled through legacy telephone networks, how IP signaling protocols are used to interoperate with current telephony systems, and how to ensure good voice quality using quality of service (QoS).

Even though Voice over IP Fundamentals is written for anyone seeking to understand how to use IP to transport voice, its target audience comprises both voice and data networking professionals. In the past, professionals working in voice and data networking did not have to understand each other's roles. However, in this world of time-division multiplexing (TDM) and IP convergence, it is important to understand how these technologies work together. Voice over IP Fundamentals explains all the details so that voice experts can understand data networking and data experts can understand voice networking.

The second edition of this best-selling book includes new chapters on the importance of billing and mediation in a VoIP network, security, and the common types of threats inherent when packet voice environments, public switched telephone networks (PSTN), and VoIP interoperate. It also explains enterprise and service-provider applications and services.

Jonathan Davidson, CCIE No. 2560, is the Director of SP Solution Engineering in Integrated Network Systems Engineering. He has co-authored Voice over IP Fundamentals and edited Deploying Cisco Voice over IP. He has been with Cisco for 10 years in post-sales support, marketing, and engineering divisions.

James Peters is the Director of Product Marketing in the Carrier Core and Multiservice Business Unit at Cisco Systems. He co-authored the first edition of Voice over IP Fundamentals and is currently authoring a book on multiservice networking. James has more than 20 years experience in building, designing Internet-based voice and data networks, and product development.

Manoj Bhatia is a Business Development Manager for Partner Programs at IP Communications Business Unit (IPCBU) for Cisco Systems, Inc. He was among the first to start the software development for SIP technology on Cisco VoIP gateways and IOS-based routers. His past projects include technical marketing for VoIP products such as media gateways, call agents, and SIP-based residential voice solutions. Prior to Cisco, Manoj worked in Nortel Networks and Summa Four (now Cisco) and has 14+ years of experience in telephony protocols such as SS7, call control, and VoIP technologies.

Satish Kalidindi is a Software Engineer with Cisco Systems. He has more than six years experience working on development and deployment of VoIP technologies. He has been involved with various products, including IOS gateways and Cisco CallManager. More recently he has been involved with security features on CCM. He is a graduate of Purdue University with an M.S in Engineering.

Sudipto Mukherjee is a Software Development Engineer with Cisco Systems. He has product development and deployment experience for a variety of telecommunication devices for wireline, wireless, and VoIP networks. More recently at Cisco he has been working on SIP gateway development. Sudipto has a Bachelors of Engineering degree in Electronics Communication engineering from GS Institute of Technology, Indore and a Masters degree in Electronics Design and technology from Indian Institute of Science, Bangalore.

Introduction

Part I PSTN

Chapter 1 Overview of the PSTN and Comparisons to Voice over IP

The Beginning of the PSTN

Understanding PSTN Basics

Analog and Digital Signaling

Digital Voice Signals

Local Loops, Trunks, and Interswitch Communication

PSTN Signaling

PSTN Services and Applications

PSTN Numbering Plans

Drivers Behind the Convergence Between Voice and Data Networking

Drawbacks to the PSTN

Packet Telephony Network Drivers

Standards-Based Packet Infrastructure Layer

Open Call-Control Layer

VoIP Call-Control Protocols

Open Service Application Layer

New PSTN Network Infrastructure Model

Summary

Chapter 2 Enterprise Telephony Today

Similarities Between PSTN and ET

Differences Between PSTN and ET

Signaling Treatment

Advanced Features

Common ET and PSTN Interworking

ET Networks Provided by PSTN

Private ET Networks

Summary

Chapter 3 Basic Telephony Signaling

Signaling Overview

Analog and Digital Signaling

Direct Current Signalin8

In-Band and Out-of-Band Signaling

Loop-Start and Ground-Start Signaling

CAS and CCS

E&M Signaling

Type I

Type II

Type III

Type IV

Type V

CAS

Bell System MF Signaling

CCITT No. 5 Signaling

R1

R2

ISDN

ISDN Service5

ISDN Access Interface6

ISDN L2 and L3 Protocols

Basic ISDN Call

QSIG

QSIG Service4

QSIG Architecture and Reference Points

QSIG Protocol Stac5

QSIG Basic Call Setup and Teardown Example

DPNSS

Summary

Chapter 4 Signaling System 7

SS7 Network Architecture

Signaling Elements

Signaling Links

SS7 Protocol Overview

Physical Layer-MTP L1

Data Layer-MTP L2

Network Layer-MTP3

SCCP

TUP

ISUP

TCAP

SS7 Examples

Basic Call Setup and Teardown Example

800 Database Query Example

List of SS7 Specifications

Summary

Chapter 5 PSTN Services

Plain Old Telephone Service

Custom Calling Features

CLASS Features

Voice Mail

Business Services

Virtual Private Voice Networks

Centrex Services

Call Center Services

Service Provider Services

Database Service

Operator Services

Summary

Part II Voice over IP Technology

Chapter 6 IP Tutorial

OSI Reference Model

The Application Layer

The Presentation Layer

The Session Layer

The Transport Layer

The Network Layer

The Data Link Layer

The Physical Layer

Internet Protocol

Data Link Layer Addresses

IP Addressing

Routing Protocols

Distance-Vector Routing

Link-State Routing

BGP

IS-IS

OSPF

IGRP

EIGRP

RIP

IP Trans…