{"product_id":"9781847193742","title":"Building Telephony Systems with OpenSER","description":"\u003cb\u003eIn Detail\u003c\/b\u003e\u003cp\u003eOpenSER 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.\u003cbr\u003e\u0026amp;nbsp;\u003cbr\u003eEngineered 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. \u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003eIt 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.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003eThis 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.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eApproach\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003eThis book is a well illustrated, step-by-step guide to building a SIP based network using OpenSER.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eWho this book is for\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003eThis book is for readers who want to understand how to build a SIP provider from scratch using OpenSER. Telephony and Linux experience will be helpful but is not essential. Readers need not have prior knowledge of OpenSER.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Packt Publishing","offers":[{"title":"Default Title","offer_id":47165447078128,"sku":"9781847193742","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9781847193742_p0.jpg?v=1763748749","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9781847193742","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}