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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  » Read more...

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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.