Except as otherwise provided in subsection (2) of this section, the administrator may act as the tribunal described in ORS 110.504 (Tribunal of state) in the establishment of paternity or of a child support order, or in the modification or enforcement of a child support order.(2)(a) When a hearing is requested pursuant to ORS 25.513 (Hearings procedure), the tribunal is the Office of Administrative Hearings, except as provided in ORS 25.550 (Establishing paternity of child).