Table of Contents
Preface 1
Chapter 1: An Introduction to Telephony and Asterisk 7
The Basics of Traditional Telephony 8
Circuit Switching 8
A Circuit-Switched Network 9
Signalling System # 7 (SS7) 10
Integrated Services Digital Network (ISDN) 11
The Basics of Voice over IP (VoIP) Technology 13
Session Initiation Protocol??”SIP 14
Inter-Asterisk eXchange Protocol??”IAX 16
NAT/PAT: IAX2 versus SIP and H.323 17
CODECS??”Voice Coder Decoder 17
Asterisk??”The Open-Source PBX 19
Asterisk is Dually Licensed??”What Does it Mean? 20
Enter the Asterisk??”the Future is Here 20
AsteriskNOW??”The Asterisk Software Appliance 21
Summary 22
Chapter 2: Building a PBX 23
Objective??”Building an Office PBX 23
Physical Connectivity 24
Installation Procedure Outline 25
Downloading AsteriskNOW 26
AsteriskNOW Hardware Requirements 26
The Installation Process 29
Anatomy of the AsteriskNOW Configuration GUI 46
Introduction to the rPath Appliance GUI 47
Summary 48
Table of Contents
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Chapter 3: Extensions, Phones, and Others 49
An IP Phone is a Simplified Computer 49
AsteriskNOW Extension Management GUI 50
The User Extensions Configuration Options 52
The "User Extension" Configuration Flags 52
The LinkSys 941 55
CounterPath X-Lite??”The Worlds Most Popular Soft Phone 60
Summary 63
Chapter 4: Service Providers??”Your Connection to the World 65
VoIP Carriers 65
Direct Inward Dialing (DID/DDI) Carriers 66
IP Call Termination Carriers 66
Refilers and Grey Routes 67
PSTN Carriers??”Traditional Telephony Providers 68
Configuring an IP Termination Service Provider 69
VoIP Service Providers in AsteriskNOW 69
VoIP Service Providers??”Few Examples 72
Inbound DID/DDI Service Providers 72
Termination and Residential Service Providers 73
Connecting to a Custom VoIP Termination Provider 74
Summary 76
Chapter 5: Tentacles of the PBX??”The Calling Rules Tables 77
Managing Routing Rules with AsteriskNOW 78
Manually Editing Dial-Plan Logic 79
Summary 84
Chapter 6: "Let me in!"??”Inbound Call Routing 85
Inbound DID Routing versus Analog Physical Routing 85
Inbound Routing via DID Numbers 85
Inbound Routing via Physical Ports 86
Routing Type Comparison Table 86
Inbound Call Routing with AsteriskNOW 86
Example 1: Routing in a Single DID Number 88
Example 2: Routing in a Range of DID Numbers 89
Inbound Call Routing in extensions.
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