(1) The parties to an interconnection agreement may amend or modify an agreement which has been approved by the Commission by—
(a) giving not less than 30 days written notice prior to the effective date of the amendment or modification; and
(b) submitting a copy of the proposed amendment or modification to the Commission.
(2) An amendment or modification to any interconnection agreement is not to take effect unless approved by the Commission within 30 days of its submission, or such longer period as the Commission may in any case determine.