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
Welcome To Kamailio – The Open Source SIP Server
Kamailio® (successor of former OpenSER and SER) is an Open Source SIP Server released under GPLv2+, able to handle thousands of call setups per second. Kamailio can be used to build large platforms for VoIP and realtime communications – presence, WebRTC, Instant messaging and other applications. Moreover, it can be easily used for scaling up SIP-to-PSTN gateways, PBX systems or media servers like Asterisk™, FreeSWITCH™ or SEMS.
Among the powerful features: asynchronous TCP, UDP and SCTP, secure communication via TLS for VoIP (voice, video, text); WebSocket support for WebRTC; IPv4 and IPv6; SIMPLE instant messaging and presence with embedded XCAP server and MSRP relay; asynchronous operations; IMS extensions for VoLTE; ENUM; DID and least cost routing; load balancing; routing fail-over; accounting, authentication and authorization; support for many backend systems such as MySQL, Postgres, Oracle, Radius, LDAP, Redis, Cassandra, MongoDB, Memcached; Json and XMLRPC control interface, SNMP monitoring.
~ RELEVANT PAST EVENTS~
May 23, 2022 – Kamailio – New Major Version v5.6.0 Released – with seven new modules, NATS PubSub connector, a lot of new variables and transformations, enhancements to STIR/SHAKEN extensions, more flexibility in handling SIP headers and body. For the latest minor release in 5.6 series, check the download link in the right sidebar.
September 3, 2021 – 20 years of development anniversary for Kamailio project
Kamailio World Conferences – 1st edition (Apr 16-17, 2013); 2nd edition (Apr 2-4, 2014); 3rd edition (May 27-29, 2015); 4th edition (May 18-20, 2016); 5th edition (May 8-10, 2017); 6th edition (May 14-16, 2018); 7th edition (May 6-8, 2019); 8th edition (April 27-29, 2020)
Kamailio Developers Meetings – 1st edition (Sep 27-28, 2018); 2nd edition (Nov 14-15, 2019)
December 20, 2012 – Kamailio – SER integration process is completed, the project will continue to use the name Kamailio
September 02, 2011 – 10 years SER Conference
Kamailio SIP Router at Google Summer of Code 2011
September 01, 2009 – Kamailio awarded Best Open Source Networking Software 2009
November 04, 2008 – Kamailio (OpenSER) and SIP Express Router (SER) teamed up to integrate back their source trees, known as the SIP Router Project.
July 28, 2008 – due to trademark issues, OpenSER was renamed to Kamailio. Click here to listen the new name jingle
June 14, 2005 – OpenSER project is created as a spin off of SIP Express Router (SER)
September 19, 2002 – SIP Express Router (SER) is released as open source under GPLv2
September 2, 2001 – SIP Express Router (SER) project is started by FhG Fokus Research Institute, Berlin, Germany
Kamailio can be used on systems with limited resources as well as on carrier grade servers. It is written in pure C for Unix/Linux-like systems with architecture specific optimizations to offer high performances. Kamailio Project aims to be a collaborative environment of its users to develop secure and extensible SIP server to provide modern Unified Communication and VoIP services.
Kamailio World 2023 – Call for Presentations January 23, 2023
Kamailio v5.6.3 Released January 11, 2023
Happy New Year 2023! January 1, 2023
Merry Christmas And Happy Winter Holidays 2022-2023! December 25, 2022
kamailio.org maintenance work – Dec 14, 2023 December 11, 2022
Online Devel Meeting – Dec 08, 2022, 15:00UTC November 30, 2022
Kamailio At ClueCon 2022 October 10, 2022
– Download latest release –
Modules Docs – Stable
Modules Docs – Devel
Wiki Site – 5.6.x+
Wiki Site – 5.5.x-
Browse Sources
SIP Services
Chat Channels
Devel Guide
Kamailio Code of Conduct
Old Wiki Site – 5.5.x-
Old SourceForge Project
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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