VAT 
Visual Audio Tool 
This Unix-based audio teleconferencing tool, developed by the Lawrence Berkeley National Laboratory, enables you to talk to one or more people over an Internet connection. In most cases, all you need is the program, an IP connection, and audio hardware (if not included in your computer system). The VAT program's window is divided into two parts: the right pane controls the local audio and the left pane displays the status of the other parties participating in the conference. The software runs on the following Unix-based systems: SunOS or Solaris running on Sparc stations; DEC OSF-3.x and DEC Ultrix; HPUX-9 on Hewlett-Packard systems with built-in audio; SGI Irix-5 running on SGI Indy, Indigo, or Indigo2 systems; IBM x86 BSD/OS 2 running on compatible IBM machines. It is also compatible with the Linux operating system.