This book starts with the simplest configuration and evolves chapter by chapter, teaching you how to add new features and modules. It will first teach you the basic concepts of SIP and SIP routing. Then you will start applying the theory by installing OpenSIPS and creating the configuration file. You will learn about features such as authentication, PSTN connectivity, user portals, media server integration, billing, NAT traversal, and monitoring. The book uses a metaphor of a VoIP provider to explain OpenSIPS. The idea is to have a simple but complete running VoIP provider by the end of the book.
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