It's My Phone!
Stop telephone salespeople from interfering with your home life.
This program can block Unavailable, Private, No Numbers, Blocked and 555 prefix call from your telephone. In the registered version it will also allow you to enter a blocked list of number you don't want to receive calls from. Also the ability to restrict incoming calls to just numbers you list in the allowed box.
All you need is a computer, modem that can receive Caller ID information and Windows Operation system.
The program is free, just click on the download link below.