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Kamailio v4.4 ============= Table of contents I. About Kamailio II. Feature List III. Getting started IV. About the project V. Obtaining Help VI. Contributions VII. More Information I. About Kamailio ================= Kamailio is an industrial-strength, free server for realtime communication, based on the Session Initiation Protocol (SIP RFC3261). It is engineered to power Realtime Communications such as IP telephony and presence infrastructures up to large scale. With embedded support for WebSockets/WebRTC, HTTP, XSRP and XMLrpc as well as Json-rpc it's a modern server, up to date with current standards on IPv4/IPv6 and TLS security. Kamailio keeps track of users, sets up multimedia sessions, relays instant messages and creates space for new plug-in applications. Its proven interoperability guarantees seamless integration with components from other vendors, eliminating the risk of a single-vendor trap. Kamailio has successfully participated in various interoperability tests in which it worked with the products of other leading SIP vendors. The Kamailio software enables a flexible plug-in model for new applications: third parties can easily link their plug-ins with the server code and provide thereby advanced and customized services. With a modern RPC interface, 3rd party application can integrate and interact with services provided by Kamailio. By using the EVAPI interface or the embedded HTTP server restful applications can be built. Kamailio's performance and robustness allows it to serve millions of users and accommodate needs of very large operators. With a low-cost dual-CPU, the Kamailio server is able to power IP telephony services in an area as large as the Bay Area during peak hours. The Kamailio server is extremely configurable to allow the creation of various routing and admission policies as well as setting up new and customized services. Its configurability allows it to serve many roles: network security barrier, presence server, application server, IMS server or PSTN gateway guard (Edge Proxy / Session Border Controller) for example. II. Feature List ================ Please visit for the most up-to-date feature list. Note that as features easily are added as modules, changes can occur quickly. Most of Kamailio's features are implemented as plug-in modules. See our web site for a current list. III. Getting started ==================== The documentation wiki is an important source of tutorials for installing and understanding how Kamailio works: * The INSTALL document provides more details and guidelines that will help with the installation. Kamailio is composed of a core and additional modules. For each module there is a README with documentation on how to configure and use the module. These are available in each modules source code directory as well as on the web site. We recommend that you continue with reading README-MODULES and then the document named INSTALL. IV. About ======================== The Kamailio project has roots in a line of projects starting with SIP Express Router, then OpenSER and now Kamailio. A merge project was started during the fall of 2008 by developers from the OpenSER project, recently renamed to and SIP Express Router (SER) from Kamailio is the result of a merge of the code base and years of experience from both developer teams. During the development of the release 4.0, autumn-winter of 2012, the merger of the products was completed and a unified product was released. See for the story of SER, OpenSER and Kamailio. V. Obtaining Help ================= We offer best-effort free support for Kamailio. "best-effort" means that we try to solve your problems via email as soon as we can, subject to available manpower. To receive feedback to your inquiries, we recommend you to subscribe to the sr-users mailing list and post your queries there. This mailing list is set up for mutual help by the community of Kamailio users and developers. To participate in the mailing list, subscribe at the following web address: The IRC channel #kamailio on is a place where to meet and discuss with other members of Kamailio community. VI. Contributions ================= Kamailio is an open source project managed and developed by its community. Anyone is welcome to join the development efforts and contribute with code, documentation or other resources that could help the project. For code contributions, follow the suggestions provided at: * The recommended way to contribute code is via pull requests to Kamailio project on Github: * VII. More Information ===================== Most up-to-date information is always available at our website: Particularly, it includes: - administrator's guide - configuration cookbooks (core, pseudovariables and transformations) - module documentation - installation guidelines (INSTALL) - download links - etc.