Tenn. Code Ann. § 36-5-3106: Procedure to contest validity or enforcement of registered order

(a) A nonregistering party seeking to contest the validity or enforcement of a registered order pursuant to this part shall request a hearing within fifteen (15) days after the date of mailing of the notice of the registration. The nonregistering party may seek to vacate the registration, to assert any defense to an allegation of noncompliance with the registered order, or to contest the remedies being sought or the amount of any alleged arrearages.

(b) If the nonregistering party fails to contest the validity or enforcement of the registered order in a timely manner, the order is confirmed by operation of law.

(c) If a nonregistering party requests a hearing to contest the validity or enforcement of the registered order, the registering court shall schedule the matter for hearing and give notice to the parties of the date, time and place of the hearing.