Or. R. Civ. P. 6
As amended through June 11, 2024
A court of this state having jurisdiction of the subject matter may, without a summons having been served upon a party, exercise jurisdiction in an action over a party with respect to any counterclaim asserted against that party in an action which the party has commenced in this state and also over any party who appears in the action and waives the defense of lack of jurisdiction over the person, insufficiency of summons or process, or insufficiency of service of summons or process, as provided in Rule 21(G). Where jurisdiction is exercised under Rule 5, a defendant may appear in an action and defend on the merits, without being subject to personal jurisdiction by virtue of this rule.
Or. R. Civ. P. 6