Make any voluntary or optional payment, prepayment or repayment on, redemption, exchange or acquisition for value of, or any sinking fund or any other payment with respect to, any Subordinated Indebtedness, except as permitted by the subordination provisions in the applicable Subordinated Debt Documents and any subordination agreement with respect thereto in favor of the Administrative Agent and the Lenders; provided that no payments of principal, interest, fees or other amounts shall be made in respect of the Ribbon Shareholder Indebtedness, other than non-cash paid-in-kind interest.