Section 5-506. (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 source of periodic income in the commonwealth in the same manner as if such order had been issued by a tribunal of the commonwealth. The provisions of section 6—604 shall apply to such contest.
(b) The obligor shall give notice of the contest to:
(1) any support enforcement agency providing services to the obligee;
(2) each employer or other source of periodic income that has directly received an income withholding order; and
(3) the person or agency designated to receive payments in the income withholding order or, if no such person or agency is designated, to the obligee.