The U.S. Supreme Court has rejected a bid by telemarketers to end restrictions on their business.
The firms enraged millions of U.S. consumers by telephoning their homes to sell products, often interrupting family dinners and other private moments.
U.S. officials set up a list of phone numbers that telemarketers are not supposed to call.
Tens of millions of Americans quickly put their names and numbers on the "Do Not Call" list. Telemarketers are forbidden to call these numbers under threat of severe fines.
Telemarketing companies went to court to overturn the "Do Not Call" registry, arguing the restriction violated their right to free speech.
The top U.S. court offered no explanation when it declined to hear the appeal.