(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, 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.