OpenSER - the Open Source SIP Server



OpenSER - the Open Source SIP Server
OpenSER at LinuxTag, Berlin, Germany, May 30 - June 2, 2007. More details here...
OpenSER Advanced Programming Course, Paris, June 4-6, 2007. More details here...
OpenSER v1.2.0 Released

March 12, 2007

A new major release - OpenSER v1.2.0 - is out. The new version introduces many improvements to existing features and lot of new functionalities that allow to expand services beyond voice communication. Announcement here ...

Performance tests of OpenSER v1.2.0 are available here...

OpenSER Summit 2006

The first OpenSER Summit took place in Berlin, on the 8th November, 2006. The summit was hosted inside the VoN Autumn Europe, Hall 8. For more details, please follow this link. Agenda & Special Guests. You can get now Photos & Slides from the event. If you want to guide selecting the location for next OpenSER summit, vote on the poll located at bottom, on left side in this page.


OpenSER is a mature and flexible open source SIP server (RFC3261). It can be used on systems with limitted resources as well as on carrier grade servers, scaling to up to thousands call setups per second. It is written in pure C for Unix/Linux-like systems with architecture specific optimizations to offer high performances. It is customizable, being able to feature as fast load balancer; SIP server flavours: registrar, location server, proxy server, redirect server; gateway to SMS/XMPP; or advanced VoIP application server.

OpenSER aims to be a collaborative project of its users to develop secure and extensible SIP server to provide modern VoIP services. Anyone can contribute to one of next items:
- code development - OpenSER 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

Basic rules for contributions and the list of contributions you can read in this page .