Wis. Stat. § 769.301: Proceedings under this chapter.

(1) Except as otherwise provided in this chapter, this subchapter applies to all proceedings under this chapter.

(3) An individual petitioner or a support enforcement agency may commence a proceeding authorized under this chapter by filing a petition in an initiating tribunal for forwarding to a responding tribunal or by filing a petition or a comparable pleading directly in a tribunal of another state or a foreign country that has or can obtain personal jurisdiction over the respondent.