(a) Except as provided in subsection (b), the provisions of this Act shall not apply to telephone calls made by an autodialer. The provisions of this Act do not apply to telephone calls made by a person who is a registered dealer, registered investment adviser, or registered salesperson under Section 8 of the Illinois Securities Law of 1953 or who is registered as a broker-dealer, registered representative, or salesperson of a broker-dealer under the federal securities laws, when performing acts within the scope of that registration.
     (b) Notwithstanding the provisions of subsection (a), all telephone calls must be made in compliance with the requirements of subsection (c) of Section 15.