Disclaimer: this page contains statements about some events in the pasts. The statements were valid at the moment when the specific event happened and the situations may have changed afterwards. If you feel that there is inaccurate information, please contact one of the board members of Kamailio (OpenSER) project.

On November 04, 2008 – Kamailio® (OpenSER) and SIP Express Router (SER) started the SIP Router project.

Main goal was to join the efforts of the two development teams to build a solid and flexible open source SIP server that ensures trust for the future. On January 11, 2010, Kamailio (OpenSER) v3.0.0 was released, representing first version built from full integration of source trees from Kamailio (OpenSER) and SIP Express Router (SER) projects, offering all features of the two SIP servers, along with new developments and a SIP expertise started in 2001.

On July 28, 2008 – OpenSER was renamed to Kamailio due to trademark issues.

The old domain openser.org is no longer available for the project. The person that registered openser.org back in 2005 created a fork named opensips shortly after OpenSER to Kamailio renaming and few days later redirected openser.org to his new project.

Mailing lists, archives, dokuwiki, downloads, documentation repositories and the rest of resources you were used to within the website and project are available under kamailio.org domain — all versions since June 14, 2005 – you need just to replace openser.org with kamailio.org.

SourceForge project still exists under openser name and belongs to Kamailio project:

OpenSER versions from 0.9.4 to 1.3.x will still be maintained and hosted under the new domain kamailio.org. The name for old releases will continue to be OpenSER.

Kamailio® was registered as a trademark in the European Union to prevent issues like this in the future. The Management is now ensured by an interim group working to create a foundation that will take care of project administration to avoid in the future situations as above. See more…

Kamailio (OpenSER) History

A timeline based history of SIP Router project is available at http://sip-router.org/history/.

Between 2005 and 2008, Kamailio (OpenSER) had standalone source code repository and its evolution was independent of SIP Express Router (SER), summarized in the next paragraphs.

OpenSER project started on the 14th June, 2005. It looks as an young project, but actually it is full of history.

Origin of OpenSER goes back in 2001-2002, at FhG FOKUS research institute in Berlin, Germany. In autumn 2002, the SIP Express Router (SER) project was released open source under GPL license and the source tree moved to BerliOS open source mediator site. During 2005 the evolution of the public project developed in new directions.

In June 2005, two SER core developers Daniel-Constantin Mierla, Bogdan-Andrei Iancu and one main contributor Elena-Ramona Modroiu started OpenSER project (Wikipedia). OpenSER venture was conducted by the different views in the management and development of the open source project (policy about contributions, release cycles and development effort).

The fork allowed for development of the new open source project to start quickly (a roadmap was put in place, a management board has been formed, a policy about contributions has been defined, the new release cycles have been established).

Some of SER main contributors joined OpenSER Project: Juha Heinanen, Adrian Georgescu, Klaus Darilion, Dan Pascu, Andreas Granig, Dmitry Isakbaev, Di Shi Sun, Cesc Santasusana. New developers joined: Henning Westerholt, Ovidiu Sas, Carsten Bock, Inaki Baz Castillo, Alex Balashov. After one year and a half, the project counted over 80 people contributing with code, patches or documentation, having 20 registered developers.

First OpenSER release happened on the 14th June 2005, versioned 0.9.4 – source code forked from SER branch 0.9.0. Since then, many releases were out, known as the series: 0.9.x, 1.0.x, 1.1.x, 1.2.x, 1.3.x, 1.4.x and 1.5.x. After 1.5.x, newer released (first being 3.0.0) were built out of SIP Router project.

To understand the role of Kamailio (OpenSER) in SIP Router project context see SIP Router Releases and Kamailio SIP Router Releases pages.