Preamble

SER was developed by FhG Fokus and released open source under GPL in the autumn of 2002, becoming in short time the reference implementation for a SIP server. In summer 2005, OpenSER forked, succeeding over the time to build a strong community around the project, ensuring solid development cycles and documentation. OpenSER faced trademarks issues and was renamed to Kamailio at the end of July 2008. Soon after it was forked (again) by OpenSIPs.

Nowadays

The open source SIP server market is dominated by the flavors of SIP Express Router. However, as each projects targets more or less same application type - SIP Signaling Server - many cannot easily decide which one to pick up and be sure is the right for its needs. It is also a big concern about which project will develop the most over the time.

Many developers believe the existing situation harms all projects and the community. Several discussions were initiated during the summer of 2008 to create a reliable environment for all involved: developers, business and community.

Over the last months two projects accepted to advance with the discussion to something more concrete, unfortunately others were not responsive to this initiative. SER and Kamailio (OpenSER) teams worked to shape the collaboration terms, the most important aspect was the willingness to join the effort in building an application for the benefit of all, being either developers or community members.

So was born The SIP Router Project.

Next diagram should give a better visual understanding of the past and present events.