Asterisk: The Definitive Guide. Open Source Telephony for the Enterprise. 5th Edition - Helion
ebook
Autor: Jim Van Meggelen, Russell Bryant, Leif MadsenISBN: 978-14-920-3155-0
stron: 414, Format: ebook
Data wydania: 2019-06-24
Księgarnia: Helion
Cena książki: 203,15 zł (poprzednio: 236,22 zł)
Oszczędzasz: 14% (-33,07 zł)
Design a complete Voice over IP (VoIP) or traditional PBX system with Asterisk, even if you have only basic telecommunications knowledge. This bestselling guide makes it easy with a detailed roadmap that shows you how to install and configure this open source software, whether you’re upgrading your existing phone system or starting from scratch.
Ideal for Linux administrators, developers, and power users, this updated fifth edition shows you how to write a basic dialplan step-by-step and brings you up to speed on the features in Asterisk 16, the latest long-term support release from Digium. You’ll quickly gain working knowledge to build a simple yet inclusive system.
- Integrate Asterisk with analog, VoIP, and digital telephony systems
- Build an interactive dialplan using best practices for more advanced features
- Delve into voicemail options such as storing messages in a database
- Connect to external services including Google Hangouts, XMPP, and calendars
- Incorporate Asterisk features and functions into a relational database to facilitate information sharing
- Learn how to use Asterisk’s security, call routing, and faxing features
- Monitor and control your system with the Asterisk Manager Interface (AMI)
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Spis treści
Asterisk: The Definitive Guide. Open Source Telephony for the Enterprise. 5th Edition eBook -- spis treści
- Foreword
- Joshua Colp (Senior Software Developer, Sangoma/Digium)
- Dan Jenkins (Founder, Nimble Ape Ltd)
- Joyce Wilmot (Senior Web Developer)
- Matt Florell (Founder, VICIdial)
- Matt Fredrickson (Director of Asterisk Engineering, Sangoma/Digium)
- Preface
- Audience
- Software
- Conventions Used in This Book
- OReilly Online Learning
- How to Contact Us
- Acknowledgments from Jim Van Meggelen
- 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 Hackers PBX
- Asterisk: The Professionals PBX
- The Asterisk Community
- Asterisks Discourse-Based Community Site
- The Asterisk Mailing Lists
- Asterisk Wiki Sites
- The IRC Channels
- Conclusion
- Asterisk and VoIP: Bridging the Gap Between Traditional and Network Telephony
- 2. Asterisk Architecture
- Modules
- Applications
- Bridging Modules
- Call Detail Recording Modules
- Channel Event Logging Modules
- Channel Drivers
- Codec Translators
- Format Interpreters
- Dialplan Functions
- PBX Modules
- Resource Modules
- Configuration backends
- Calendar integration
- Other resource modules
- Add-on Modules
- Test Modules
- File Structure
- Configuration Files
- Modules
- The Resource Library
- The Spool
- Logging
- The Dialplan
- Hardware
- Asterisk Versioning
- Conclusion
- Modules
- 3. Installing Asterisk
- Linux Installation
- Choosing Your Platform
- VirtualBox Steps
- Linux (OpenStack) Host
- Dependencies
- Asterisk Installation
- Download and Prerequisites
- Compiling and Installing
- Initial Configuration
- SELinux Tweaks
- Firewall Tweaks
- Final Tweaks
- Validating Your New Asterisk System
- Common Installation Errors
- Some Final Configuration Notes
- Sample Configuration Files for Future Reference
- The Asterisk Shell Command
- safe_asterisk
- Conclusion
- Linux Installation
- 4. Certificates for Endpoint Security
- The Inconvenience of Security
- Securing SIP
- Subscriber Names
- Secure SIP Signaling
- Self-signed certificates
- LetsEncrypt certificates
- Purchasing certificates from a formal certificate authority
- Securing Media
- Encrypted RTP
- Conclusion
- 5. User Device Configuration
- Telephone Naming Concepts
- Hardphones, Softphones, and ATAs
- Configuring Asterisk
- How Channel Configuration Works with the Dialplan
- chan_pjsip
- Adding an endpoint
- Testing to Ensure Your Devices Have Registered
- A Basic Dialplan to Test Your Devices
- Under the Hood: Your First Call
- Conclusion
- 6. Dialplan Basics
- Dialplan Syntax
- Contexts
- Extensions
- Priorities
- Unnumbered priorities
- The same => operator
- Priority labels
- Applications
- The Answer(), Playback(), and Hangup() Applications
- A Basic Dialplan Prototype
- A Simple Dialplan
- Hello World
- Building an Interactive Dialplan
- The Goto(), Background(), and WaitExten() Applications
- Handling Invalid Entries and Timeouts
- Using the Dial() Application
- Argument 1: destination
- Argument 2: timeout
- Argument 3: option
- Argument 4: URI
- Updating the dialplan
- Blank arguments
- Using Variables
- Global variables
- Channel variables
- Environment variables
- Adding variables to our dialplan
- Variable concatenation
- Inheriting channel variables
- Pattern Matching
- Pattern-matching syntax
- North American Numbering Planpattern-matching examples
- Common global pattern matches
- Using the ${EXTEN} channel variable
- Includes
- Conclusion
- Dialplan Syntax
- 7. Outside Connectivity
- The Basics of Trunking
- Fundamental Dialplan for Outside Connectivity
- The PSTN
- Traditional PSTN Trunks
- Analog telephony
- Digital telephony
- Traditional PSTN Trunks
- VoIP
- Network Address Translation
- Endpoints behind NAT
- Asterisk behind NAT
- PSTN Termination and Origination
- PSTN termination
- PSTN origination
- Configuring SIP Trunks
- Connecting an Asterisk system to a SIP provider
- Configure trunks for termination
- Configuring trunks for origination
- Connecting an Asterisk system to a SIP provider
- Network Address Translation
- Emergency Dialing
- Conclusion
- 8. Voicemail
- The voicemail.conf File
- An Initial voicemail.conf File
- The [general] Section
- The [zonemessages] Section
- Mailboxes
- Voicemail Dialplan Integration
- The VoiceMail() Dialplan Application
- The VoiceMailMain() Dialplan Application
- Standard Voicemail Keymap
- Creating a Dial-by-Name Directory
- Voicemail to Email
- Voicemail Storage Backends
- Linux Filesystem
- IMAP
- Message Storage in a Database
- Conclusion
- The voicemail.conf File
- 9. Internationalization
- Devices External to the Asterisk Server
- PSTN Connectivity, DAHDI, Digium Cards, and Analog Phones
- DAHDI Drivers
- Internationalization Within Asterisk
- Caller ID
- Language and/or Accent of Prompts
- Time/Date Stamps and Pronunciation
- ConclusionEasy Reference Cheat Sheet
- 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()
- GoSub
- Defining Subroutines
- Returning from a Subroutine
- Local Channels
- Using the Asterisk Database
- Storing Data in the AstDB
- Retrieving Data from the AstDB
- Deleting Data from the AstDB
- Using the AstDB in the Dialplan
- Handy Asterisk Features
- Conferencing with ConfBridge()
- Handy Dialplan Functions
- CALLERID()
- CHANNEL()
- CURL()
- CUT()
- IF() and STRFTIME()
- LEN()
- REGEX()
- STRFTIME()
- Conclusion
- Expressions and Variable Manipulation
- 11. PBX Features, Including Parking, Paging, and Conferencing
- features.conf
- The [general] Section
- The [featuremap] Section
- The [applicationmap] Section
- Application Map Grouping
- Parking and Paging
- Call Parking
- Paging (aka Public Address)
- Places to Send Your Pages
- External paging
- Set paging
- Multicast paging via the MulticastRTP channel
- SIP-based paging adapters
- Combination paging
- Bringing it all together
- Zone Paging
- Advanced Conferencing
- Video Conferencing
- Conclusion
- features.conf
- 12. Automatic Call Distribution Queues
- Creating a Simple ACD Queue
- Queue Members
- Controlling Queue Members via the CLI
- Defining Queue Members in the queue_members Table
- Controlling Queue Members with Dialplan Logic
- Automatically Logging Into and Out of Multiple Queues
- Advanced Queues
- Priority Queue (Queue Weighting)
- Queue Member Priority
- Changing Penalties Dynamically (queuerules)
- Announcement Control
- Overflow
- Controlling timeouts
- Controlling when to join and leave a queue
- Using Local Channels
- Queue Statistics: The queue_log File
- Conclusion
- 13. Device States
- Device States
- Checking Device States
- Extension States Using the hint Directive
- Hints
- Checking Extension States
- SIP Presence
- Using Custom Device States
- Conclusion
- Device States
- 14. The Automated Attendant
- An AA Is Not an IVR
- Designing Your AA
- The Greeting
- The Main Menu
- Selection 1
- Selection 2
- Selection #
- Selection 3
- Selection 9
- Selection 0
- Timeout
- Invalid
- Dial by Extension
- Building Your AA
- Recording Prompts
- Using the dialplan to create recordings
- The Dialplan
- Delivering Incoming Calls to the AA
- IVR
- Recording Prompts
- Conclusion
- 15. Relational Database Integration
- Your Choice of Database
- 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
- Database Integration of ACD Queues
- Storing Dialplan Parameters for a Queue in a Database
- Writing queue_log to Database
- Conclusion
- 16. Introduction to Interactive Voice Response
- Components of an IVR
- IVR Design Considerations
- Asterisk Modules for Building IVRs
- CURL()
- func_odbc
- AGI
- AMI
- ARI
- A Simple IVR Using CURL()
- The Dialplan
- A Prompt-Recording IVR Function
- Speech Recognition and Text-to-Speech
- Text-to-Speech
- Speech Recognition
- Conclusion
- 17. Asterisk Manager Interface and Call Files
- Call Files
- Your First Call File
- Notes About Call Files
- AMI Quick Start
- AMI over TCP
- AMI over HTTP
- Configuration
- manager.conf
- http.conf
- Protocol Overview
- Message Encoding
- Events
- Actions
- AMI over HTTP
- Authentication and session handling
- /rawman (/arawman) encoding
- /manager (/amanager) encoding
- /mxml (/amxml) encoding
- Manager events
- Message Encoding
- Example Usage
- Originating a Call
- Redirecting a Call
- Development Frameworks
- Conclusion
- Call Files
- 18. Asterisk Gateway Interface
- Quick Start
- AGI Variants
- Process-Based AGI
- EAGI
- FastAGIAGI over TCP
- Async AGIAMI-Controlled AGI
- Process-Based AGI
- AGI Communication Overview
- Setting Up an AGI Session
- Process-based AGI/FastAGI
- Async AGI
- Commands and Responses
- Process-based AGI/FastAGI
- Async AGI
- Ending an AGI Session
- Process-based AGI/FastAGI
- Async AGI
- Setting Up an AGI Session
- Example: Account Database Access
- Development Frameworks
- Conclusion
- 19. Asterisk REST Interface
- ARI Quick Start
- Basic Asterisk Configuration
- Testing Your Basic ARI Environment
- Working with Your ARI Environment Using Swagger
- The Building Blocks of ARI
- REST
- WebSocket
- Stasis
- Frameworks
- ari-py (and aioari) for Python
- node-ari-client
- AsterNET.ARI
- ari4java
- phpari
- aricpp
- asterisk-ari-client
- Conclusion
- ARI Quick Start
- 20. WebRTC
- The Browser as a Telephone
- Preliminary Knowledge
- Configuring Asterisk for WebRTC
- Cyber Mega Phone
- More About WebRTC
- Conclusion
- 21. System Monitoring and Logging
- logger.conf
- Reviewing Asterisk Logs
- Logging to the Linux syslog Daemon
- Verifying Logging
- Log Rotation
- Call Detail Records
- CDR Contents
- Dialplan Applications
- cdr.conf
- Backends
- cdr_adaptive_odbc
- cdr_csv
- cdr_custom
- cdr_manager
- cdr_odbc
- cdr_sqlite
- cdr_sqlite3_custom
- cdr_syslog
- Example Call Detail Records
- Single-party call
- Caveats
- Channel Event Logging
- Conclusion
- logger.conf
- 22. Security
- Scanning for Valid Accounts
- Authentication Weaknesses
- Fail2ban
- Installation
- Configuration
- Encrypted Media
- Dialplan Vulnerabilities
- Securing Asterisk Network APIs
- Other Risk Mitigation
- Resources
- ConclusionA Better Idiot
- 23. Asterisk: A Future for Telephony
- The Telephone Is Dead (Except When Its Not)
- Communications Overload
- The Problems with Open Source Development
- The Future of Asterisk
- WebRTC
- The Future of Telephony
- Index