(1) Unless the parties otherwise agree, the Tribunal shall decide how and by whom the fees and expenses of the members of the Tri- bunal, the expenses and charges of the Secretariat and the expenses incurred by the parties in connection with the proceeding shall be borne. The Tribunal may, to that end, call on the Secretariat and the parties to provide it with the information it needs in order to formulate the division of the cost of the proceeding between the parties.