Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full end-to-end 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.
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