Information and Communication Technologies [No. 15 of 2009 149 45. (1) The parties to an agreement shall, where interconnection, access or co-location is established before the execution of an interconnection, access or co-location agreement, within sixty days of the establishment, agree on interim interconnection, access or co-location charges for a specified period until the interconnection, access or co-location agreement becomes effective. Interim arrangements for interconnection, access or colocation Where the parties fail to agree within the sixty day period referred to under subsection (1), such charges as the Authority may determine shall apply. Where an interconnection, access or co-location agreement comes into effect, it shall be deemed to have applied from the date the interconnection, access or co-location was established. (4) The parties shall, where subsection (3) applies, adjust retroactively any charges previously agreed or imposed by the Authority and thereafter effect payments in accordance with the provisions of the interconnection, access or co-location agreement. 46. Any requests or refusals for interconnection, access or co- location shall be made in writing, sent by registered post and copied to the Authority. Authority to be copied 47. (1) Subject to the other provisions of this Act, a licensee may set and revise tariffs in relation to electronic communications services. Tariffs for services to public (2) A licensee shall, in setting any tariffs under subsection (1), observe the following principles: tariffs shall be transparent and non discriminatory, and be based on the cost of providing the service; cross subsidies shall be eliminated; and (c) tariffs shall not contain discounts that unreasonably prejudice the competitive opportunities of other licensees providing electronic communications services to the public. (3) A licensee shall submit to the Authority for approval, the tariffs the licensee intends to charge including the justification, prior to their introduction. (4) The Authority shall approve or reject the proposed tariffs within thirty days of receipt: