Ohio Rev. Code § 3115.506: Contest by obligor.

(A) An obligor may contest the validity or enforcement of an income-withholding order issued in another state and received directly by an employer or other payor in this state by registering the order in a court of this state and filing a contest to that order as provided in sections 3115.601 to 3115.616 of the Revised Code, or otherwise contesting the order in the same manner as if the order had been issued by a tribunal of this state.

(B) The obligor shall give notice of the contest to all of the following:

(1) A support enforcement agency providing services to the obligee;

(2) Each employer or other payor that has directly received an income-withholding order relating to the obligor;

(3) The person designated to receive payments in the income-withholding order or, if no person is designated, the obligee.