(750 ILCS 22/506)

Sec. 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 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