Austrian GO box
This box should be obtained from a service area before or just after entering Austria even if you are transiting the country. The information and documentation required include the vehicle registration document and description of the vehicle, how many axles, gross weight, and time in the country. The box will then be pre-primed with the necessary payment for the duration. If the box requires payment top-up it will give multiple bleeps.
Info from Jean & John Duff.