Wikipedia
Ekiga (, formerly called GnomeMeeting) is a VoIP and video conferencing application for GNOME and Microsoft Windows. It is distributed as free software under the terms of the GNU General Public License. It was the default VoIP client in Ubuntu until October 2009, when it was replaced by Empathy. Ekiga supports both the SIP and H.323 (based on OPAL) protocols and is fully interoperable with any other SIP compliant application and with Microsoft NetMeeting. It supports many high-quality audio and video codecs.
Ekiga was initially written by Damien Sandras in order to graduate from the Université catholique de Louvain. It is currently developed by a community-based team led by Sandras. The logo was designed based on his concept by Andreas Kwiatkowski.
Ekiga.net also serves as a free and private SIP registrar, which enables its members to originate and terminate (receive) calls from and to each other directly over the Internet.