Section 308.4 - Special rule for infrequent publications(a) The provider of any pay-per-call service that advertises a pay-per-call service in a publication that meets the requirements set forth in § 308.4(c) may include in such advertisement, in lieu of the cost disclosures required by § 308.3(b) , a clear and conspicuous disclosure that a call to the advertised pay-per-call service may result in a substantial charge.(b) The provider of any pay-per-call service that places an alphabetical listing in a publication that meets the requirements set forth in § 308.4(c) is not required to make any of the disclosures required by §§ 308.3(b), (c) , (d) and (f) in the alphabetical listing, provided that such listing does not contain any information except the name, address and telephone number of the pay-per-call provider.(c) The publication referred to in § 308.4(a) and (b) must be: (2) Printed annually or less frequently; and(3) One that has an established policy of not publishing specific prices in advertisements.