Okla. Stat. tit. 43, § 43-601-506: Contest of order

A. An obligor may contest the validity or enforcement of an

income-withholding order issued in another state and received

directly by an employer in this state by registering the order in a

tribunal of this state and filing a contest to that order as

provided in Article 6 of this title, 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:

1. A support enforcement agency providing services to the

obligee;

2. Each employer that has directly received an income-

withholding order relating to the obligor; and

3. The person designated to receive payments in the income-

withholding order or if no person is designated, to the obligee.