1)   SP Dialer 1.40
Award winning 3 in 1 solution - advanced Internet dialer, time synchronizer and proxy server. It can redial multiple lines, restore broken connections, calculate online time, cost and traffic, launch and close programs, synchronize clock and so on.

 2)   Repeat Dialer 3.52.1
If a number is busy, this program will recheck that number repeatedly for availability. You'll hear a ring signal when the line becomes free. You can redial on ring signals too. This is useful for radio contests and call-in television show voting.