Asterisk is the world's leading open-source PBX, telephony engine, and telephony applications toolkit with immense flexibility. 'Asterisk Gateway Interface 1.4 and 1.6 Programming' book by 'Nir Simionovich' will give you a firm understanding of Asterisk Gateway Interface (AGI) development and proper AGI development practices. You will learn how to design and develop Asterisk-based VoIP telephony platforms and services using PHP and PHPAGI.
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