To go to Austria you must have an Austrian visa, the maximum time that each Iranian can stay in Austria is 90 days for each half year. You do not need to go to the embassy to apply for an Austrian visa, you will need to contact the embassy by email. Register your request in the embassy email, then wait for the news from the embassy. Of course, you should know that these applications will be registered and processed in the VFS offices, and in special cases, the embassy will intervene.