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date: 16 мая 2008 / author: izograv / views: 5301 / comments: 0
Building Telephony Systems with OpenSER by Flavio C Goncalves
This book teaches how to develop a fast and flexible Session Initiation Protocol (SIP) server using OpenSER and shows how OpenSER can be used to implement features not available in Asterisk PBX.
OpenSER is a flexible, free open-source VoIP server based on the Session Initiation Protocol (SIP), an application-layer control (or signaling) protocol for creating, modifying, and terminating sessions with one or more participants, including internet telephone calls, multimedia distribution, and multimedia conferences.
Engineered to power IP telephony infrastructures up to large scale, OpenSER is written in pure C for Linux/Unix-like systems with architecture-specific optimizations to offer high performance; it is able to handle 4 million users on a single processor server. The server keeps track of users, sets up VoIP sessions, relays instant messages, and creates space for new plug-in applications.
It can be used on systems with limited resources as well as on carrier-grade servers, scaling up to thousands of call setups per second. It is customizable, being able to feature as fast load balancer; SIP server flavors: registrar, location server, proxy server, redirect server; gateway to SMS/XMPP; or advanced VoIP application server.
What you will learn from this book
* An introduction to SIP
* An overview of SIP Proxies
* Compiling and installing OpenSER
* SIP Proxy default configuration
* Implementing MySQL support for authentication
* Installing the user portal (SerWEB)
* Connecting to the PSTN using a gateway
* Sending a call to voicemail
* NAT traversal using mediaproxy
* Billing with Freeradius and CDRTool
* Troubleshooting tips and tools.
This book is a well illustrated, step-by-step guide to building a SIP based network using OpenSER.
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