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Continuous Development Since 2001
SER-Kamailio - the project that shaped the evolution of open source real time communications
Powering Open Real Time Communications
SIP Load Balancer, IP Telephony Engine, Least Cost Routing, SIP Firewall, Edge Proxy, SBC, Registrar and Location Service, Instant Messaging and Presence, MSRP, WebRTC, IPv4-IPV6, IMS, VoLTE
23Feb/10

New features in development branch

February 23, 2010Newskamailio, openser, ser, sip routeradmin

A bit more than one month since first official release of branch 3.0 and the development branch includes lot of new features: seven new modules additions to pv, blst, uac, xlog andRead More…

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02Feb/10

Kamailio v1.5.4 Released

February 2, 2010Newskamailio, openser, ser, sip routeradmin

Kamailio v1.5.4 is out – a minor release of the branch 1.5, including fixes since v1.5.3 – configuration file and database compatibility is preserved… A new release in 1.5 series is out.Read More…

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02Feb/10

Kamailio v1.4.5 Released

February 2, 2010Newsadmin

Kamailio v1.4.5 is out – a minor release of the branch 1.4, including fixes since v1.4.4 – configuration file and database compatibility is preserved… A new release in 1.4 series is out.Read More…

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29Jan/10

FOSDEM 2010 Brussels

January 29, 2010Newskamailio, openser, ser, sip routeradmin

There will be a lightning talk about Kamailio (OpenSER) 3.0.0 on the main track at FOSDEM 2010, the annual meeting of free and open source developers. It is already a tradition thatRead More…

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18Jan/10

Siremis v1.0.0 Released

January 18, 2010Newskamailio, openser, ser, sip router, siremisadmin

Siremis v1.0.0 is out – web management interface for Kamailio (OpenSER) 3.0.0 A new version of SIREMIS Web Management Interface for Kamailio (former OpenSER) and SIP Router is available as v1.0.0. SiremisRead More…

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11Jan/10

Kamailio (OpenSER) v3.0.0 Released

January 11, 2010Newsadmin

Kamailio (OpenSER) v3.0.0 is out – major release with astonishing number of new features and improvements … On January 11, 2010, Kamailio (OpenSER) 3.0.0 has been released – this is a specialRead More…

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21Dec/09

VUC: Kamailio – Asterisk

December 21, 2009Newsadmin

Alex Balashov of Evariste Systems, active community member and contributer, running a VoIP consultancy business in USA, leads a VoIP User Conference about Kamailio, the role of Asterisk, the role of SERRead More…

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01Sep/09

Best of Open Source Software Awards 2009

September 1, 2009Newsadmin

Kamailio (OpenSER) winner at InfoWorld’s Best of Open Source Software Awards 2009, within category Best of Open Source Networking Software … InfoWorld has published the Best of Open Source Software Awards 2009.Read More…

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04Nov/08

The SIP Router Project

November 4, 2008Newskamailio, openser, ser, sip routeradmin

The sip-router.org project launched Nov 04, 2008 – join of Kamailio (OpenSER) and SIP Express Router (SER). The SIP Router Project aims to build a solid open source SIP routing platform, basedRead More…

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07Aug/08

Kamailio (OpenSER) v1.4.0 Released

August 7, 2008Newskamailio, openseradmin

Kamailio (OpenSER) v1.4.0 was released – this major release brings many improvements to stability, code refactoring as well as new features, the first major under new name. Details about it: https://www.kamailio.org/w/kamailio-openser-v1.4.0-release-notes/

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News

  • Kamailio v6.0.7 Released June 19, 2026
  • Kamailio v6.1.3 Released May 27, 2026
  • Sipexer v2.0.0 Released May 25, 2026
  • Kamailio v6.1.2 Released April 22, 2026
  • Security Advisories: Core And Auth Module – April 7, 2026 April 8, 2026
  • Kamailio v5.8.8 Released March 6, 2026
  • Kamailio v6.0.6 Released March 5, 2026
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– Download latest release –

6.1.3

(May 27, 2026)

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Short History

The initial name of the project was SIP Express Router (aka SER), started in 2001 by Fraunhofer Fokus Research Institute and released under GPLv2 in 2002. In 2005, OpenSER project spawned from SER and had to change the name to Kamailio in summer of 2008 due to trademark claims. During the autumn of 2008, Kamailio and SER teams decided to join back the projects and use further the Kamailio name.

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