Minute Beep is the tool that helps you to reduce call charges. Don't pay for an extra minute because of two seconds.
Program features:

plays sound periodically to notify you about next minute of a call; can hang up the phone automatically after user specified call duration; can start automatically when phone is switched on

Update! Minute Beep 1.3
Fixed bug with call waiting / multiple simultaneous calls Improved reliability (previous version of the program stopped processing calls under specific conditions)