California Code, Family Code - FAM § 6384

(a) If a respondent named in an order issued under this part after a hearing has not been served personally with the order but has received actual notice of the existence and substance of the order through personal appearance in court to hear the terms of the order from the court, no additional proof of service is required for enforcement of the order.

If a respondent named in a temporary restraining order or emergency protective order is personally served with the order and notice of hearing with respect to a restraining order or protective order based on the temporary restraining order or emergency protective order, but the respondent does not appear at the hearing either in person or by counsel, and the terms and conditions of the restraining order or protective order issued at the hearing are identical to the temporary restraining or emergency protective order, except for the duration of the order, the restraining order or protective order issued at the hearing may be served on the respondent by first-class mail sent to the respondent at the most current address for the respondent that is available to the court.

(b) The Judicial Council forms for orders issued under this part shall contain a statement in substantially the following form:

“If you have been personally served with a temporary restraining order and notice of hearing, but you do not appear at the hearing either in person or by a lawyer, and a restraining order that is the same as this temporary restraining order except for the expiration date is issued at the hearing, a copy of the order will be served on you by mail at the following address:  ____.

If that address is not correct or you wish to verify that the temporary restraining order was converted to a restraining order at the hearing without substantive change and to find out the duration of that order, contact the clerk of the court.”