Kamailio, formerly OpenSER (and sharing some common history with SIP Express Router (SER)), is a SIP server licensed under the GPL-2.0-or-later license. It can be configured to act as a SIP registrar, proxy or redirect server, and features presence support, RADIUS/ syslog accounting and authorization, XML-RPC and JSON-RPC-based remote control, SQL and

NoSQL A NoSQL (originally referring to "non- SQL" or "non-relational") database provides a mechanism for storage and retrieval of data that is modeled in means other than the tabular relations used in relational databases. Such databases have existed ...

backends,

IMS Ims is a Norwegian surname. Notable people with the surname include: * Gry Tofte Ims (born 1986), Norwegian footballer * Rolf Anker Ims (born 1958), Norwegian ecologist See also * IMS (disambiguation) Ims is a Norwegian surname. Notable people wit ...

VoLTE Voice over LTE (VoLTE) is an LTE high-speed wireless communication standard for mobile phones and data terminals, including Internet of things (IoT) devices and wearables. VoLTE has up to three times more voice and data capacity than older 3G U ...

extensions and others.

Kamailio is a Hawaiian word. Kama'ilio means talk, to converse. "It was chosen for its special flavour."

Features

Kamailio is written in pure C with architecture-specific optimizations; it can be configured for many scenarios including small-office use, enterprise PBX replacements and carrier services—it is SIP signaling server—a proxy—aiming to be used for large real-time communication services. Features include: * SIP telephony system * SIP load balancer * SIP security firewall * Least cost routing engine * IMS/VoLTE platform * Instant messaging and presence services * SIP IPv4-IPv6 gateway * MSRP relay * SIP-WebRTC gateway

Usage

Kamailio is used by large

Internet Service Providers An Internet service provider (ISP) is an organization that provides services for accessing, using, or participating in the Internet. ISPs can be organized in various forms, such as commercial, community-owned, non-profit, or otherwise privatel ...

to provide public telephony service. The largest public announced deployment with several million of users is in operation at the German ISP '' 1&1''. Another large deployment is in operation at the provider sipgate.

Forks

OpenSIPS

OpenSIPS, a fork of SER which has diverged—deciding to "go their own way" from the SER and OpenSER codebases—is a free software implementation of SIP for voice over IP (VoIP) that can be used to handle voice, text and video communication. OpenSIPS is intended for installations serving thousands of calls and is IETF RFC 3261 compliant. The software was recognized by Google in 2017 with their Open Source Peer Bonus award.

History

Kamailio's roots go back to 2001, when the first line of SIP Express Router (SER) was written; at the time, the working group published results a
iptel.org
��in September 2002 the code itself was published under the GPL. The first fork of SER came in 2005—OpenSER—which would later merge back into the code that would become Kamailio. The codebases of SER and OpenSER (by then known as Kamailio) converged in December 2012, and it was decided to continue to use Kamailio as the main name of the project, which remains open source. During the first years of development, ''serweb''—a web-based user provisioning—was available.

Timeline

;2001 :*SIP Express Router (SER) is initially developed by the

Fraunhofer Institute for Open Communication Systems The Fraunhofer Institute for Open Communication Systems, or FOKUS, is an organization of the Fraunhofer Society. Headquartered in Berlin (Charlottenburg), the institute is engaged in applied research and development in the field of Information an ...

(FOKUS) ;2002 :*First third-party contribution ( ENUM module) :;September ::*Code is GPL'd and first published ;2003 :*Adoption by the general public begins; additional free and open source code is contributed by independent third parties ;2004 :*Part of the FOKUS team moves, with the SER copyrights, to the newly created company iptel.org :*Two of the five SER core developers and one main contributor start a new

free Free may refer to: Concept * Freedom, having the ability to do something, without having to obey anyone/anything * Freethought, a position that beliefs should be formed only on the basis of logic, reason, and empiricism * Emancipate, to procur ...

and

open source Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. The open-source model is a decentralized sof ...

software project named OpenSER. ;2005 :*The company IPtel.org is bought by TEKELEC, and is responsible for the TEKELEC session router and CSCF. ;2007 :;May 12 ::*SER 2.0 RC-1 (Ottendorf) is made available ;2008 :;August ::*OpenSER is renamed Kamailio to avoid conflict with similar trademarks :;November 4 ::*Kamailio developers sketch and announce a plan to team up with the SER developers to create the future sip-router project ;2013 :*FOKUS and the Kamailio community organize the first iteration of the annual 'Kamailio World' conference in Berlin, Germany.

References

External links

{{Portal, Free and open-source software
Kamailio Homepage
Telephony software Free VoIP software Free server software Free routing software