The Kamailio® SIP server is a leading Open Source software for building SIP services such as a SIP proxy, SIP Presence Server, SIP location server and much more. With a rich configuration language, modularity and continuous development Kamailio is the choice for building enterprise as well as carrier solutions. Kamailio runs on Unix and Linux systems, ranging from embedded systems to large scale multi-core servers.
Kamailio is the result of over 10 years of development, in the SIP express router project, the Open SER project and the SIP Router project. Kamailio is the result of a merger of multiple projects, a collaboration process that started on November 4, 2008. To understand the meaning of Kamailio in the SIP please see the Kamailio SIP Router Releases pages.
Kamailio is released under GNU Public License v2 (GPLv2) or (at your option) any later version. Beginning with 3.0.0, the application includes parts of code under BSD license that can be used as such with individual components.
Kamailio can be:
- SIP proxy server
- SIP registrar server
- SIP location server
- SIP application server
- SIP dispatcher server
- SIP Websocket server
A more detailed list of capabilities is available in features page
Kamailio cannot be:
- SIP phone
- media server
- back-to-back user agent
We invite individuals, academic institutes or companies to actively take part in the development of the project. It is not only about writing C code, you can help with:
- code development – core, modules and adjacent applications
- documentation – writing or enriching documentation
- miscellaneous – different management tasks (e.g., web site maintenance)
- ideas – new ideas bring brilliant solutions
Join our mailing lists, start using and contributing to the SIP server.
Evolution of the project over the time is summarized in History page.