SIP and IAX2 compatible VoIP phone - GNOME client

 SFLphone is a SIP/IAX2 compatible softphone for Linux. The SFLphone project's
 goal is to create a robust enterprise-class desktop phone. While it can serve
 home users very well, it is designed with a hundred-calls-a-day receptionist
 in mind.
 .
 It features a flexible client/server architecture where the GTK+ client talks
 to the daemon through DBus and is capable of handling multiple VoIP connections
 at once.
 .
 This is the graphical client for GNOME.