Okla. Stat. tit. 43, § 43-601-204: Simultaneous proceedings in another state or foreign

country

A. A tribunal of this state may exercise jurisdiction to

establish a support order if the petition or comparable pleading is

filed after a pleading is filed in another state or a foreign

country only if:

1. The petition or comparable pleading in this state is filed

before the expiration of the time allowed in the other state or the

foreign country for filing a responsive pleading challenging the

exercise of jurisdiction by the other state or the foreign country;

2. The contesting party timely challenges the exercise of

jurisdiction in the other state or the foreign country; and

3. If relevant, this state is the home state of the child.

B. A tribunal of this state may not exercise jurisdiction to

establish a support order if the petition or comparable pleading is

filed before a petition or comparable pleading is filed in another

state or foreign country if:

1. The petition or comparable pleading in the other state or a

foreign country is filed before the expiration of the time allowed

in this state for filing a responsive pleading challenging the

exercise of jurisdiction by this state;

2. The contesting party timely challenges the exercise of

jurisdiction in this state; and

3. If relevant, the other state or a foreign country is the

home state of the child.