When it states clearly on the DO NOT CALL homepage about scammers and YOUR REGISTRATION WILL NOT EXPIRE!
Scammers have been making phone calls claiming to represent the National Do Not Call Registry. The calls claim to provide an opportunity to sign up for the Registry. These calls are not coming from the Registry or the Federal Trade Commission, and you should not respond to these calls. To add your number to the Registry you can call 888-382-1222 from the phone you wish to register, or go click on “Register a Phone Number” in the left column of this page.
Your registration will not expire. Telephone numbers placed on the National Do Not Call Registry will remain on it permanently due to the Do-Not-Call Improvement Act of 2007, which became law in February 2008. Read more about it at http://www.ftc.gov/opa/2008/04/dncfyi.shtm.
Got call just a few minutes ago. This is probably a call center that represents different kinds of clients. The VM I got said it was Kaiser University. I do not ever answer any phone # that I do not recognize.