ORS § 25.170
When a support obligation is more than one month in arrears, the Attorney General or a district attorney may upon motion obtain an order requiring the obligor to appear for the purpose of examination regarding the obligor's financial circumstances. The court shall require the obligor to appear at a time and date certain at such place as may be appropriate. The order to appear shall inform the obligor that the obligor's answers may be used in subsequent enforcement and possible criminal proceedings, and that the obligor has a right to be represented by an attorney at the examination. The order shall be served upon the obligor in the same manner as service of summons. The order to appear shall also be served upon the obligee by regular mail. The obligee shall have the right to attend any such examination.
ORS 25.170