(1) Except as provided in subsection (2), if the commission is requested by a telecommunications carrier to establish wholesale prices for services provided by a telecommunications carrier, the commission may not establish a wholesale price using a default proxy discount value to be applied to the applicable retail price. The commission shall establish wholesale prices using company-specific costs.
(2) This section does not apply to the prices, terms, and conditions of a final or interim arbitrated interconnection agreement, arbitration decision, or appeal from an agreement or decision if the request for arbitration was filed on or before March 1, 1997.