The Do-Not-Call Registry gives you a choice about whether to get telemarketing calls to your home or not. There is only one Registry and it is run by The Federal Trade Commission. Once you been on The Do-Not-Call Registry for about 31 days, telemarketers should not call you anymore. It may not stop all telemarketers from calling. The best part is, if you get a telemarketing call, then you can file a complaint online. Telemarketing used to be very popular to bring in sales, but now that many people are on the Registry it is used less.