Description:

RAT (Robust-Audio Tool) is a network audio tool that allows users to
particpate in audio conferences over the internet. These can be
between two participants directly, or between a group of participants
on a common multicast group. No special features are required to use
RAT in point-to-point mode, but to use the multicast conferencing
facilities of RAT, a connection to the Mbone, or a similar multicast
capable network, is required. RAT is based on IETF standards, using
RTP above UDP/IP as its transport protocol, and conforming to the RTP
profile for audio and video conferences with minimal control.