1 A Telephony Revolution

2 V0IP:Bridging The Gap Between Traditional and Network Telephony

3 Massive Change Requires Flexible Technology

5 Asterisk: The Hacker's PBX

5 Asterisk: The Professional's PBX

6 The Asterisk Community

8 The Business Case

9 This Book

11 Preparing a System for Asterisk

13 Server Hardware Selection

21 Environment

25 Telephony Hardware

29 Types of Phones

34 Linux Considerations

34 Conclusion

37 Installing Asterisk

38 What Packages Do I Need?

40 Obtaining the Source Code

42 Menuselect

43 Compiling Zaptel

47 Compiling Libpri

48 Compiling Asterisk

50 Installing Additional Prompts

51 Common Compiling Issues

54 Loading Asterisk and Zaptel Quickly

55 Loading Zeptel modules Without Scripts

57 Loading Libpri Without Scrpts

57 Starting Asterisk Without Scripts

59 Directories Used By Asterisk

62 AsteriskNOW

67 Conclusion

69 Initial Configuration of Asterisk

70 What Do I Really Need?

71 Working With Interface Configuration Files

73 Starting up The Dualplan for some Test Calls

73 FXO and FXS Channels

73 Configuring an FXO Channel For a PSTN Connection

79 Configuring an FXS Channel For an Analog Telephone

81 Configuring SIP Telephone

97 Connecting to a SIP Service Provider

101 Connecting Two Asterisk Boxes Together Via SIP

106 Configuring an LAX Softphone

110 Connecting To an IAX Service Provider

111 Connecting Two Asterisk Boxes Together Via IAX

115 Using Templates In Your Configuration Files

116 Debugging

117 Conclusion

119 Dialplan Basic

119 Dialplan Syntax

124 A Simple Dialplan

127 Building An Interactive Dialplan

144 Conclusion

145 More Dialplan Concepts

145 Expressions and Variable Manipulation

148 Dialplan Functions

149 Conditional Branding

153 Voicemail

157 Macros

160 Using The Asterisk Database (AstDB)

163 Handy Asterisk Features

165 Conclusion

167 Analog Telephony

170 Digital Telephony

180 The Digital Circuit-switched Telephone Network

184 Packer-Switched Network

184 Conclusion

185 Protocols for VolP

186 The Need For VolP Protocols

187 VolP Protocol

193 Codes

197 Quality Of Service

200 Echo

202 Asterisk and VolP

204 VolP Security

206 Conclusion

207 The Asterisk Gateway Interface (AGI)

207 Fundamentals of AGI Communication

210 Writing AGI Scripts in Perl

214 Creating AGI Scripts in PHP

219 Writing AGL Scripts in Python

223 Debugging in AGI

225 Conclusion

227 Asterisk Manager Interface (AMI) and Adhearsion

227 The Managers Interface

231 The Flash Operator Panel

231 Asterisk Development with Adhearsion

245 The Asterisk GUI Framework

245 Why a GUI For Asterisk?

246 What is The GUI?

248 Architecture of the Asterisk

249 Installing the Asterisk GUI

251 Developing for the Asterisk GUI

263 Relational Database Integration

263 Introduction

263 Installing the Database

265 Installing and Configuring ODBC

268 Using Realtime

272 Storing Call Detail Record

274 Getting Funky with func_odbc Hoc Deskıng

286 ODBC Voıcemaıl

291 conclusıon

293 Managıng Your Asterısk System

293 Call Detaıl Recodıng

295 Managıng Logs

295 Runnıng Asterısk As a Non-Root User

298 Customızıng System Prompt

299 Musıc On Hokl

302 Conclusıon

303 Potpourrı

303 Festıval

306 Call Fıles

307 DUNDı

312 Alternatıve Voıcemaıl Storage Methods

315 Asterısk and Jabber (XMPP)

316 Conclusion

317 Asterisk: The Future of Telephony

317 The Problem With Traditional Telephony

320 Paradigm Shift

320 The Promise of Open Source Telephony

327 The Future of Asterisk

337 VolP Channel

367 Application Reference

449 AGI Reference

461 Configuration Files

493 Asterisk Dialplan

515 Asterisk Manager Interface Actions

551 An Example of FUNC_odbc

557 Index