Okla. Stat. tit. 30, § 30-3-317: Registration of out-of-state guardianship order

If a guardian has been appointed in another state and a petition

for the appointment of a guardian is not pending in this state, the

guardian appointed in the other state, after giving notice to the

appointing court of an intent to register, may register the

guardianship order in this state by filing as a foreign judgment in

a court, in any appropriate county of this state, certified copies

of the order and letters of office.