Asterisk™: The Definitive Guide Asterisk Guide, 4th Edition

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Copyright
Table of Contents
Foreword
- Matt Jordan (Engineering Manager, Digium)
- Alex Balashov (Principal, Evariste Systems)
- Kevin McAllister (VP of Engineering, CoreDial, LLC)
- Brian Capouch (Computer Science Department, Saint Joseph’s College [Indiana])
Preface
- Audience
- Organization
- Software
- Conventions Used in This Book
- Using Code Examples
- Safari® Books Online
- How to Contact Us
- Acknowledgments
Chapter 1. A Telephony Revolution
- Asterisk and VoIP: Bridging the Gap Between Traditional and Network Telephony
  - The Zapata Telephony Project
- Massive Change Requires Flexible Technology
- Asterisk: The Hacker’s PBX
- Asterisk: The Professional’s PBX
- The Asterisk Community
- The Business Case
- Conclusion
Chapter 2. Asterisk Architecture
- Modules
- File Structure
- The Dialplan
- Hardware
- Asterisk Versioning
- Conclusion
Chapter 3. Installing Asterisk
- Installation Cheat Sheet
- Distribution Installation
  - RHEL Server
  - Ubuntu Server
- Software Dependencies
- Downloading What You Need
  - Getting the Source via Subversion
  - Getting the Source via wget
- How to Install It
- Base Configuration
  - Initial Configuration
  - make menuselect
- Updating Asterisk
- Common Issues
- Upgrading Asterisk
- Conclusion
Chapter 4. Initial Configuration Tasks
- asterisk.conf
- modules.conf
  - The [modules] Section
- indications.conf
- musiconhold.conf
  - Converting Music to a Format That Works Best with Asterisk
  - Default musiconhold.conf file
- Additional Configuration Files
- Conclusion
Chapter 5. User Device Configuration
- Telephone Naming Concepts
- Hardphones, Softphones, and ATAs
- Configuring Asterisk
- Digium Phones with Asterisk
- Loading Your New Channel Configurations
  - The Asterisk CLI
- Testing to Ensure Your Devices Have Registered
- Analog Phones
- A Basic Dialplan to Test Your Devices
- Under the Hood: Your First Call
- Conclusion
Chapter 6. Dialplan Basics
- Dialplan Syntax
- A Simple Dialplan
  - Hello World
- Building an Interactive Dialplan
- Conclusion
Chapter 7. Outside Connectivity
- The Basics of Trunking
- Fundamental Dialplan for Outside Connectivity
- PSTN Circuits
  - Traditional PSTN Trunks
  - Installing PSTN Trunks
- VoIP
- Emergency Dialing
- Conclusion
Chapter 8. Voicemail
- Comedian Mail
- Dialplan Integration
- Storage Backends
- Using Asterisk as a Standalone Voicemail Server
  - Integrating Asterisk into a SIP Environment as a Standalone Voicemail Server
  - SMDI (Simplified Message Desk Interface)
- Database Integration
- Conclusion
Chapter 9. Internationalization
- Devices External to the Asterisk Server
- PSTN Connectivity, DAHDI, Digium Cards, and Analog Phones
  - DAHDI Drivers
- Asterisk
- Conclusion—Easy Reference Cheat Sheet
Chapter 10. Deeper into the Dialplan
- Expressions and Variable Manipulation
  - Basic Expressions
  - Operators
- Dialplan Functions
  - Syntax
  - Examples of Dialplan Functions
- Conditional Branching
  - The GotoIf() Application
  - Time-Based Conditional Branching with GotoIfTime()
- Macros
- GoSub
- Local Channels
- Using the Asterisk Database (AstDB)
- Handy Asterisk Features
- Conclusion
Chapter 11. Parking, Paging, and Conferencing
- features.conf
- Overhead and “Underchin” Paging (a.k.a. Public Address)
  - Places to Send Your Pages
  - Zone Paging
- Advanced Conferencing
- Conclusion
Chapter 12. Internet Call Routing
- DNS and SIP URIs
- ENUM and E.164
- ISN, ITAD, and freenum.org
- Security and Identity
- Conclusion
Chapter 13. Automatic Call Distribution (ACD) Queues
- Creating a Simple ACD Queue
- Queue Members
- The queues.conf File
- The agents.conf File
- Advanced Queues
- Queue Statistics: The queue_log File
- Conclusion
Chapter 14. Device States
- Device States
  - Checking Device States
- Extension States
  - Hints
  - Checking Extension States
- SIP Presence
  - Asterisk Configuration
- Using Custom Device States
  - An Example
- Distributed Device States
  - Using Corosync
  - Using XMPP
- Shared Line Appearances
- Creating a Callback Service
- Conclusion
Chapter 15. The Automated Attendant
- An Auto Attendant Is Not an IVR
- Designing Your Auto Attendant
- Building Your Auto Attendant
- Conclusion
Chapter 16. Relational Database Integration
- Installing and Configuring PostgreSQL and MySQL
- Installing and Configuring ODBC
- Managing Databases
  - Troubleshooting Database Issues
  - SQL Injection
- Powering Your Dialplan with func_odbc
- A Gentle Introduction to func_odbc
- Getting Funky with func_odbc: Hot-Desking
- Using Realtime
  - Static Realtime
  - Dynamic Realtime
- Storing Call Detail Records (CDR)
- ODBC Voicemail Message Storage
- Database Integration of ACD Queues
- Conclusion
Chapter 17. Interactive Voice Response
- What Is IVR?
- Components of an IVR
- IVR Design Considerations
- Asterisk Modules for Building IVRs
- A Simple IVR Using CURL
  - Installing the cURL Module
  - The Dialplan
- A Prompt-Recording Application
- Speech Recognition and Text-to-Speech
  - Text-to-Speech
  - Speech Recognition
- Conclusion
Chapter 18. External Services
- Calendar Integration
- Voicemail IMAP Integration
  - Compiling IMAP Voicemail Support into Asterisk
- Using XMPP (Jabber) with Asterisk
- Out-of-Band Messaging (Messaging Infrastructure)
- LDAP Integration
- Text-to-Speech Utilities
  - Festival
  - Cepstral
- Conclusion
Chapter 19. Fax
- What Is a Fax?
- Ways to Handle Faxes in Asterisk
- spandsp
- Digium Fax For Asterisk
  - Obtaining Digium FFA
  - Disabling Digium FFA (Should You Want to Test spandsp)
- Incoming Fax Handling
- Outgoing Fax Handling
- Fax Pass-Through
  - Using Fax Buffers in chan_dahdi.conf
  - T.38 Gateway
- Conclusion
Chapter 20. Asterisk Manager Interface (AMI)
- Quick Start
  - AMI over TCP
  - AMI over HTTP
- Configuration
  - manager.conf
  - http.conf
- Protocol Overview
  - Message Encoding
  - AMI over HTTP
- Call Files
- Example Usage
- Development Frameworks
  - CSTA
- Interesting Applications
  - Flash Operator Panel
- Conclusion
Chapter 21. Asterisk Gateway Interface (AGI)
- Quick Start
- AGI Variants
- AGI Communication Overview
- Example: Account Database Access
- Development Frameworks
- Conclusion
Chapter 22. Clustering
- Traditional PBXs
- Hybrid Systems
- Pure Asterisk, Nondistributed
- Asterisk and Database Integration
  - Single Database
  - Replicated Databases
- Asterisk and Distributed Device States
  - Distributing Device States over a LAN
  - Distributing Device States over a WAN
- Multiple Queues, Multiple Sites
- Conclusion
Chapter 23. Distributed Universal Number Discovery (DUNDi)
- How Does DUNDi Work?
- The dundi.conf File
- Configuring Asterisk for Use with DUNDi
- Conclusion
Chapter 24. System Monitoring and Logging
- logger.conf
- Call Detail Records
- CEL (Channel Event Logging)
- SNMP
- Conclusion
Chapter 25. Web Interfaces
- Flash Operator Panel
- Queue Status and Reporting
  - Queue Status Display
  - Queue Reporting
- Call Detail Records
- A2Billing
- Conclusion
Chapter 26. Security
- Scanning for Valid Accounts
- Authentication Weaknesses
- Fail2ban
  - Installation
  - Configuration
- Encrypted Media
- Dialplan Vulnerabilities
- Securing Asterisk Network APIs
- IAX2 Denial of Service
- Other Risk Mitigation
- CLI Permissions
- Resources
- Conclusion—A Better Idiot
Chapter 27. Asterisk: A Future for Telephony
- The Problems with Traditional Telephony
- Paradigm Shift
- The Promise of Open Source Telephony
- The Future of Asterisk
Appendix A. Understanding Telephony
- Analog Telephony
  - Parts of an Analog Telephone
  - Tip and Ring
- Digital Telephony
  - Pulse-Code Modulation
- The Digital Circuit-Switched Telephone Network
  - Circuit Types
  - Digital Signaling Protocols
- Packet-Switched Networks
- Conclusion
Appendix B. Protocols for VoIP
- The Need for VoIP Protocols
- VoIP Protocols
- Codecs
  - G.711
  - G.726
  - G.729A
  - GSM
  - iLBC
  - Speex
  - G.722
  - MP3
- Quality of Service
- Echo
- Asterisk and VoIP
  - Users and Peers and Friends—Oh My!
  - register Statements
- VoIP Security
- Conclusion
Appendix C. Preparing a System for Asterisk
- Server Hardware Selection
- Environment
- Telephony Hardware
- Types of Phones
- Linux Considerations
- Conclusion
Index
About the Authors

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