The American Telemarketing Association plans to file an appeal with the Supreme Court, challenging a lower-court ruling that upheld the federal Do Not Call Registry.

"We believe that the rights to free speech are being unduly trampled under the guise of consumer protection," said ATA executive director Tim Searcy, "and now we'll take our appeal to the highest level."

But the Direct Marketing Association, a former opponent of the 'don't call' register, has decided to keep its head below the parapet. "There is more to lose than gain," said H Robert Wientzen, the DMA's chief executive.

Data sourced from: The Wall Street Journal Online; additional content by WARC staff