There are some new regulations that were recently announced by the FTC for telemarketing in the USA.
Here are some summary links and a link to the actual 111-page PDF of the official changes:
http://www.networkworld.com/community/node/31211
http://news.cnet.com/8301-13578_3-10021092-38.html
http://www.reuters.com/article/domestic ... 7520080819
http://www.ftc.gov/os/2008/08/R411001tsrfrn.pdf