Repeat Dialer will repeatedly checks a busy line until it's free. If an important number happens to be busy, Repeat Dialer will recheck that number repeatedly for availability, for up to a user-set number of minutes. If the line becomes free, you'll hear the ring signal. Just pick up your phone and start talking. You may also set the program to redial on ring signals too. This feature can be used for radio contests and call-in television voting.