Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, GTalk/Hangouts extensions, as well as OTR, ZRTP, etc.
It can handle every firewall, and has many other useful features.
Jitsi is completely open source / free software, and is freely available under the terms of the GNU Lesser General Public License. It can run on your own server.
If you want similar software to Jitsi, we have a list for that. Are there Jitsi alternatives out there? Let's find out.
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