The Canadian government passed legislation in 2005 mandating the creation of a do-not-call registry. The registry is scheduled to take effect in mid-2008, yet many Canadians may be disappointed to learn about the exemption of a wide range of organizations (registered charities, business with prior relationships, political parties, survey companies, and newspapers). Under the law, exempted organizations are permitted to make unsolicited telephone calls despite the inclusion of the number in the do-not-call registry. However, organizations must remove numbers from their lists if specifically requested to do so.
IOptOut takes advantage of this approach by allowing Canadians to create and manage a personal do-not-call list that begins where do-not-call legislation ends.
Once you create your account, you can pick and choose from categorized lists of services you do not wish to receive calls from
iOptOut then sends an email notification to each organization requesting that your name, email address and phone number(s) be removed from their active marketing lists.
My only objection is that the opposite of 'do not call' is not 'do call', but simply 'I wont hang up if you do call'.