The Federal Trade Commission (FTC) and the Federal Communications Commission (FCC) require most marketers to scrub their telephone lead lists against the National Do Not Call Registry at least once every 31 days. Fines of up to $42,530 per incident may be issued for non-compliance. You must also maintain and honor a corporate "do not call" list. There are currently 12 states that maintain their own do not call lists that need to be scrubbed against as well: CO, FL, LA, IN, MA, MI, MO, OK, PA, TN, TX, WY.
Marketers should take special care when calling wireless numbers (both those that have been ported from landlines and those with the first seven digits that match designated wireless phone exchanges). There are strict consent requirements for calling wireless numbers.
For email campaigns, the CAN-SPAM Act requires those sending commercial emails to honor "do not email" requests within 10 business days. Penalties of up to $42,530 per email sent in violation of this act may be assessed.