Okla. Stat. tit. 43, § 43-601-303
Application of law of this state
Except as otherwise provided in this act, a responding tribunal
of this state shall:
1. Apply the procedural and substantive law generally
applicable to similar proceedings originating in this state and may
exercise all powers and provide all remedies available in those
proceedings; and
2. Determine the duty of support and the amount payable in
accordance with the law and support guidelines of this state.