(a) A tribunal of this state shall apply Subchapters B through G and, as applicable, Subchapter H to a support proceeding involving:
(1) a foreign support order;
(2) a foreign tribunal; or
(3) an obligee, obligor, or child residing in a foreign country.
(b) A tribunal of this state that is requested to recognize and enforce a support order on the basis of comity may apply the procedural and substantive provisions of Subchapters B through G.
(c) Subchapter H applies only to a support proceeding under the Convention. In such a proceeding, if a provision of Subchapter H is inconsistent with Subchapters B through G, Subchapter H controls.