OpenSER is flexible, free of code abierto of the servant of VoIP based on Session Initiation Protocol (SIP), a request of control of the layer (or signaling) of protocol to create, to modify and to finalize sessions with one or more participant, including the telephone calls of Internet, the distribution of multimedia, and conferences multimedia. Directed to be able infrastructures of telephony IP on a large scale, OpenSER is written in pure C for Linux/UNIX-like systems with architecture of specific optimizations to offer a high performance, is able to handle 4 million users in a servant of unique processor. The servant realises a pursuit of the users, settles down the sessions of VoIP, relays of instantaneous messages, and creates a space for new plug-in the applications. He can be used in systems with limited resources, as well as in company of degree servants, that climb up to thousands of configurations of call per second. Servant of VoIP is personalizeable, being able to appear like examiner of accounts of fast load; flavors servant SIP: registry, location of servant, servant proxy, servant of redirection, application or front door to SMS/XMPP, outposts. What will learn of this book? - An introduction to the SIP - A general vision of proxy SIP - To compile and to install OpenSER - SIP Proxy configuration by defect - The support of MySQL of application for the authentication of - Installation of the vestibule of users (SerWEB) - Connection to the PSTN by means of a footbridge - Shipment of a call to the voice mailbox - Cross-sectional NAT using mediaproxy - Invoicing with FreeRADIUS and CDRTool - Suggestions to solve problems and tools. Approach This book is an illustrated good step, guide of passage to the creation of a network based on SIP using OpenSER. That this book is written stops? This book is for the readers who want to understand how to create a supplier SIP from zero being used OpenSER. Telephony and experience in Linux will be useful but he is not essential. The readers do not need to have a previous knowledge of OpenSER.

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