The country code (+43) is displayed first, followed by an area code (which may consist of one to four digits) and a subscriber number (which may consist of four to thirteen numbers). Both domestic and international calls are possible with this dialing format. E.164, a globally accepted standard for international telephone numbering, is followed by the Austrian phone number format. Likewise, the Austrian numbering scheme is overseen by Rundfunk und Telekom Regulierung GmbH (RTR). Note: In Austria, area codes and subscriber numbers do not have set lengths, so certain local numbers can