Cal. Code of Civil Procedure § 2029.610

(a) On filing a petition under Section 2029.600, a petitioner who is a party to the out-of-state proceeding shall pay a first appearance fee as specified in Section 70611 of the Government Code. A petitioner who is not a party to the out-of-state proceeding shall pay the fee specified in subdivision (c) of Section 70626 of the Government Code. (b) The court in which the petition is filed shall assign it a case number. (c) On responding to a petition under Section 2029.600, a party to the out-of-state proceeding shall pay a first appearance fee as specified in Section 70612 of the Government Code. A person who is not a party to the out-of-state proceeding may file a response without paying a fee. (d) Any petition, response, or other document filed under this section shall satisfy all of the following conditions: (1) It shall bear the caption and case number of the out-of-state case to which it relates. (2) The first page shall state the name of the court in which the document is filed. (3) The first page shall state the case number assigned by the court under subdivision (b). (4) The first page shall state whether or not the person filing the document is a party to the out-of-state case.