(1) Whoever advertises to a consumer using a telephone call is required to document the consumer’s prior express consent to the telephone advertising in an adequate form and at the time that consent is given and must store such documentation in accordance with subsection (2) sentence 1.
(2) Advertising enterprises must store the proof of consent referred to in subsection (1) for five years from the point in time at which the consent is given and after each use of that consent. Upon request, advertising enterprises are required immediately to submit the proof referred to in subsection (1) to the competent administrative authority as referred to in section 20 (3).