You wouldn't let strangers through your front door whenever they want, so why let anyone call you whenever they want?
Telemarketer Call Screening intercepts calls, announces that you do not accept calls from telemarketers and instructs them to add you to their "Do Not Call" list. It 'remembers' accepted callers so they always get through. Next time your phone rings, know it's someone you want to hear from. Telemarketer Call Screening. What more could you ask for?