CA Fam Code Section 5700.615

(a)

Except as otherwise provided in Section 5700.711, if a foreign country lacks or refuses to exercise jurisdiction to modify its child-support order pursuant to its laws, a tribunal of this state may assume jurisdiction to modify the child-support order and bind all individuals subject to the personal jurisdiction of the tribunal whether the consent to modification of a child-support order otherwise required of the individual pursuant to Section 5700.611 has been given or whether the individual seeking modification is a resident of this state or of the foreign country.

(b)

An order issued by a tribunal of this state modifying a foreign child-support order pursuant to this section is the controlling order.