Ekiga (formely known as GnomeMeeting) is an open source VoIP and video conferencing application for GNOME. Ekiga uses both the H.323 and SIP protocols. It supports many audio and video codecs, and is interoperable with other SIP compliant software and also with Microsoft NetMeeting. More info »
Client not working on ubuntu, not working on Arch Linux, Ekiga as a SIP provider is horible. Ekiga account is crap, never works for me.
