(b) periodic rental charges for use of facilities, equipment and resources including interconnect and switching capacity; and (c) variable charges for telecommunications services and supplementary services. (3) A licensee shall be free to acquire services from an interconnect provider at any retail price offered by the interconnect provider without prejudice to any rights to acquire the same or similar services under an interconnection agreement. (4) The Commission shall prescribe guidelines on interconnection charging methodology from time to time. 13. Interconnection procedures. (1) All requests by an interconnecting licensee for any form of interconnection shall be in writing and shall provide the interconnection licensee with information relating to— (a) the form of interconnection; (b) the date for the commencement of negotiations; (c) the approximate date the interconnection is required; and (d) an estimate of the capacity required. (2) A copy of the request for interconnection in paragraph (1) shall be forwarded to the Commission by the requesting party within seven days of the request by the requesting party. (3) The interconnect licensee shall inform the interconnecting operator in writing within fourteen days of receipt of the request for interconnection of its ability and willingness to supply the form of interconnection requested within the time frames requested by the interconnecting licensee and its ability to commence negotiations on the date requested. (4) Where the parties do not agree on the date to commence negotiations, the Commission shall facilitate negotiations to an interconnection agreement on a date specified by the Commission.