Nir Simionovich, “Asterisk Gateway Interface 1.4 and 1.6 Programming”
Packt Publishing | 2009 | ISBN: 184719446X | 220 pages | PDF | 2,5 MB

Asterisk is the world's leading open-source PBX, telephony engine, and telephony applications toolkit with immense flexibility.

This book will give you a firm understanding of Asterisk Gateway Interface (AGI) development and proper AGI development practices. You will learn how to formulate Atomic AGI-enabled scripts, enabling rapid development within a well-defined Asterisk execution and runtime environment.

This book builds from the simplest form of an Asterisk application, the dialplan-based application, gradually building a full understanding of AGI scripting. The book also introduces a new concept of AGI development named "Atomic AGI" or "Particle Programming". It will introduce you to various techniques of interacting with the user, where user interaction isn't limited to keypad-based input, but also includes recording messages from the user, sending output to the user, and controlling the call flow.

Find out how IAX can complement SIP to overcome complications encountered in current SIP-based communications.
Written by an expert in the field of telecommunications, this book describes the Inter-Asterisk Exchange protocol (IAX) and its operations, discussing the main characteristics of the protocol including NAT traversal, security, IPv6 support, interworking between IPv4 and IPv6, interworking with SIP and many others. The author presents the ways in which IAX can be activated so as to avoid complications such as NAT and the presence of intermediary boxes in operational architectures.

Publisher: Wiley (March 23, 2009) | Hardcover: 272 pages | ISBN: 0470770724 | PDF | 20 MB

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Hacking VoIP (Protocols, Attacks, and Countermeasures by Himanshu Dwivedi - ISBN-13 978-1-59327-163-3) takes a dual approach to VoIP security, explaining its many security holes to hackers and administrators. If you're serious about security, and you either use or administer VoIP, you should know where VoIP's biggest weaknesses lie and how to shore up your security. And if your intellectual curiosity is leading you to explore the boundaries of VoIP, Hacking VoIP is your map and guidebook.

Hacking VoIP will introduce you to every aspect of VoIP security, both in home and enterprise implementations. You'll learn about popular security assessment tools, the inherent vulnerabilities of common hardware and software packages, and how to:

*- Identify and defend against VoIP security attacks such as eavesdropping, audio injection, caller ID spoofing, and VoIP phishing
*- Audit VoIP network security
*- Assess the security of enterprise-level VoIP networks such as Cisco, Avaya, and Asterisk, and home VoIP solutions like Yahoo! and Vonage
Use common VoIP protocols like H.323, SIP, and RTP as well as unique protocols like IAX
*- Identify the many vulnerabilities in any VoIP network

Whether you’re setting up and defending your VoIP network against attacks or just having sick fun testing the limits of VoIP networks, Hacking VoIP is your go-to source for every aspect of VoIP security and defense.

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Barrie Dempster, .. “Asterisk 1.6: Build feature-rich telephony systems with Asterisk (With Source Code)”
September 2009 | English | ISBN-13: 978-1-847198-62-4 | 240 Pages | PDF | 5.15 MB

Asterisk is a powerful and flexible open source framework for building feature-rich telephony systems. As a Private Branch Exchange (PBX) which connects one or more telephones, and usually connects to one or more telephone lines, Asterisk offers very advanced features, including extension-to-extension calls, queues, ring groups, line trunking, call distribution, call detail rerecords, and call recording.

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