TeamTalk is a voice conferencing application, otherwise known as an Internet phone. The application allows you to talk to friends and colleagues using the Internet as audio carrier. With TeamTalk any number of people can participate in a conversation and is only limited by the bandwidth you have available.
Each user can choose his or her own audio quality which also determines the throughput required to each user. TeamTalk allows a throughput between 560 - 5850 bytes/sec. per user (so make sure those unlucky ones with a 56K modem are able to receive at your selected audio quality).