Jitsi Original author(s) Emil Ivov Developer(s) Jitsi Team and Contributors Initial release 2003; 14years ago Stable release 2.10 (build.5550) (February5, 2017; 3 months ago) Preview release 2.11 (nightly) Development status Active Written in Java Operating system Linux, Mac OS X, Windows (all Java supported) Size 52.4 MB Windows (bundles its own private JRE)[1] 78.8MB Mac OS X (includes private JRE)[2] 22MB Linux 65MB source code[3] Available in Asturian, English, French, German, Bulgarian, Japanese, Spanish, Italian, Romanian, Greek and 25 more Type Voice over Internet Protocol / instant messaging / videoconferencing License Apache 2.0[4] Website jitsi.org

Jitsi (formerly SIP Communicator) is a free and open source multiplatform[5]voice (VoIP), videoconferencing and instant messaging application for Windows, Linux, Mac OS X and Android. It supports several popular instant-messaging and telephony protocols, including open recognised encryption protocols for chat (OTR) and voice/video/streaming and voice/video conferencing (SIP/RTP/SRTP/ZRTP), as well as built-in IPv6, NAT traversal and DNSSEC. Jitsi and its source code are released under the terms of the Apache Software Licence.[6]

Work on Jitsi (then SIP Communicator) started in 2003 in the context of a student project by Emil Ivov at the University of Strasbourg.[7] It was originally released as an example video phone in the JAIN-SIP stack and later spun off as a standalone project.[8]

Originally the project was mostly used as an experimentation tool because of its support for IPv6.[9][10] Through the years, as the project gathered members, it also added support for protocols other than SIP.

Jitsi has received support from various institutions such as the NLnet Foundation,[11][12] the University of Strasbourg and the Region of Alsace[13] and it has also had multiple participations in the Google Summer of Code program.[14][15]

In 2009, Emil Ivov founded the BlueJimp company which has employed some of Jitsis main contributors[16][17] in order to offer professional support and development services[18] related to the project.

In 2011, after successfully adding support for audio/video communication over XMPPs Jingle extensions, the project was renamed to Jitsi since it was no longer a SIP only Communicator.[19][20] This name originates from the Bulgarian (wires).[21]

On November 4, 2014, Jitsi + Ostel scored 6 out of 7 points on the Electronic Frontier Foundations secure messaging scorecard. They lost a point because there has not been a recent independent code audit.[22]

On February 1, 2015, Hristo Terezov, Ingo Bauersachs and the rest of the team released[23] version 2.6 from their stand at the Free and Open Source Software Developers European Meeting 2015 event in Brussels. This release includes security fixes, removes support of the deprecated MSN protocol, along with SSLv3 in XMPP. Among other notable improvements, the OS X version bundles a Java 8 runtime, enables echo cancelling by default, and uses the CoreAudio subsystem. The Linux build addresses font issues with the GTK+ native LookAndFeel, and fixes some long standing issues about microphone level on call setup when using the PulseAudio sound system. This release also adds the embedded Java database Hyper SQL Database to improve performance for users with huge configuration files, a feature which is disabled by default. A full list of changes is[24] available on the project web site.

Jitsis conference call window on Mac OS X

Jitsi supports multiple operating systems, including Windows as well as Unix-like systems such as Linux, Mac OS X and BSD. Beta packages built for Android are available[25] but the projects roadmap describes the porting to Android as on hold.[26] It also includes:[27]

The following protocols are currently supported by Jitsi:[5]

Jitsi is mostly written in Java[32] which helps reuse most of the same code over the various operating systems it works on. Its GUI is based upon Swing. The project also uses native code for the implementation of platform specific tasks such as audio/video capture and rendering, IP address selection, and access to native popup notification systems such as Growl.

The project uses the Apache Felix OSGi implementation[33] for modularity.

Among others Jitsi uses the JAIN-SIP protocol stack for SIP support and the Jive Software Smack library[34] for XMPP.[35]

As Jitsi can handle IPv6 it is especially interesting for direct PC-to-PC (peer-to-peer) communication, for instance, if both sides were trapped behind NAT routers, but could obtain a reachable IPv6 address via a tunnel-broker.

The Jitsi community has also completed an ICE implementation called ice4j.org, which it uses to provide NAT traversal capabilities, and assist IPv4 to IPv6 transition.[36]

Audio systems supported are PortAudio, PulseAudio and WASAPI (Windows Audio Session API).

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