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California will accept whatever method of service is acceptable in Austria, or you can petition the court for permission to serve the papers by alternative method, i.e. personal service or certified mail.
Once you file the petition and have the summons issued, you will then have a case number XXXXX the case will be assigned to a judge. You have to file a "Motion for Alternative Service". If you need a template, you should contact the family law self-help center (most courts have one) and ask if they have forms for motions. You can use the template for any motion (i.e. if all you can find is a Motion for Contempt, you can follow that format because all motions are basically the same).
Once you file the Motion, you have to request a hearing where you will go before the judge and explain the circumstances and why you need permission for an alternative form of service.