Download Building Telephony Systems with OpenSER: A step-by-step by Flavio E. Goncalves PDF

By Flavio E. Goncalves

This e-book teaches the best way to strengthen a quick and versatile consultation Initiation Protocol (SIP) server utilizing OpenSER and exhibits how OpenSER can be utilized to enforce good points now not to be had in Asterisk PBX. This e-book is for readers who are looking to know the way to construct a SIP supplier from scratch utilizing OpenSER. Telephony and Linux event should be useful yet isn't really crucial. Readers don't need to have previous wisdom of OpenSER.

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Extra resources for Building Telephony Systems with OpenSER: A step-by-step guide to building a high performance Telephony System

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The core developers of SER were Andrei Pelinescu-Onciul, Bogdan-Andrei Iancu, Daniel Constantin Mierla, Jan Janak, and Jiri Kuthan. Some contributors joined the project later, namely Juha Heinamen (RADIUS, ENUM, DOMAIN, URI), Greg Fausak (POSTGRES), Maxim Sobolev (NATHELPER), Adrian Georgescu (MEDIAPROXY), Elena Ramona Modroiu (XLOG, DIAMETER, AVPOPS, SPEEDDIAL), Miklos Tirpak (Permissions), and others. OpenSER is a fork of the original SER project. org. In 2005 the commercial variant of IPtel was sold to TEKELEC.

The process will be repeated for the number of retries configured in the UAC. Server Operating as a SIP Proxy In the SIP proxy mode, the entire SIP signaling goes through the SIP proxy. This behavior will help in processes such as billing and it is, by far, the most common choice. The drawback is the overhead caused by the server in the middle of all SIP communications during the session establishment. Remember, RTP packets will always go directly from one endpoint to another, even if the server is working as a SIP proxy.

The userA calls userB using its SIP identity, called SIP URI. com. com. A call made using SIPS will use a secure transport (TLS-Transport Layer Security) between the caller and the callee. The transaction starts with userA sending an INVITE request addressed to userB. The INVITE request contains a certain number of header fields. Header fields are named attributes that provide additional information about the message; they include a unique identifier, the destination, and information about the session.

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