Australia's Do Not Call Register opened for business in May 2007. Hidden in the Frequently Asked Questions
page, under the heading "How long will my phone number stay on the register?" is the comment "Your phone number will remain on the register for three years. You can re-register for a new three-year period, or remove your registration, at any time. You can check your registration expiry date online, by telephone or by mail."
This means that the people who eagerly signed up for it in the early days are only a few months away from being in the clear and fair game for telemarketers.
Subscribers to the list may re-add their home phone number anytime before the expiry.
Note that there is to be a Statutory Review of the Do Not Call Register to be held around May next year. Unfortunately closing date for submissions has passed already.