Building a scalable and powerful telephone system that uses a SIP based VoIP provider Build SIP Protocol Cater to dozens of customers in an efficient with a powerful phone system based on pure SIP gain a competitive advantage by using VoIP technology the most scalable Learn how to avoid the trap of using the proper billing Equipped with examples -rich practical examples and case studies on latest version 1.6 OpenSIPS In Detail SIP is the most important VoIP protocol and OpenSIPS clear leader in open source pure SIP-based VoIP platform. While VoIP providers are not the only kind of SIP infrastructure created using OpenSIPS, certainly one of the most difficult to implement. This book will provide a competitive advantage by helping you to create a SIP infrastructure capable of handling tens of thousands of subscribers. This book is an update of the title Building Telephony Systems with OpenSER. The book begins with the simplest configuration and growing chapter by chapter teaching you how to add new features and modules. This book uses fiction to explain VoIP providers OpenSIPS. The idea is to have run a simple but complete provider of VoIP by the end of this book. What you will learn from this book Identify how the SIP transaction is transferred including initial request and Accelerating sequential processing SIP requests in sequence with the help of Loose Routing OpenSIPS Install on Linux platform and integrates media servers like Asterisk Getting authentication and persistence with reactive MySQL-end for OpenSIPS Administer web servers with the help of a graphical interface such as OpenSIPS control panel and serMyAdmin Connect to the PSTN gateway to send and receive calls Enable dynamic dial plan and routing by using modules DROUTING dialplan Traverse NAT using STUN and TURN Bill your customers or simply check your expenses to generate CDRs (Call Detail Records) Monitor SIP infrastructure you to keep it running smoothly Approach This is a practical, hands-on book is based on a fictional case study VoIP provider that you will build a development server using OpenSIPS 1.6. Case studies grow chapter by chapter, from installing your local development server, to complete a VoIP provider. Who is this book written for This book is for readers who want to understand how to build a SIP provider from scratch using OpenSIPS.