No it wouldn't. There are exceptions for existing business relationships -- if they are current clients, you are free to call them on matters related to that business. Now, if you were calling them up to offer them a magazine subscription that a subsidary publishes, that's more likely to be prohibited under the regualtion.
18 months, and they can no longer be contacted? Some investment customers don't make purchases for years, can take several years for investments to mature, or need change. SOme business have very long natural lapses between recurring business. And the govt is supposed to decide?
Additionally, the loopholes in this thing were a mile wide! Politicians, pollers, charities, and companies that only called intrastate were exempt. You don't think that the worst of the offenders would have restructured to adapt?