Hi, yes this is possible. I did it twice.
You are only not allowed to use it in your home country.
For example: To Munich your Interrail pass is valid from Salzburg Hbf (you have maybe to add the trip manually and add the city Salzburg as Germany).
Other border stations are: Kufstein, Passau, Brennero/Brenner, Tarvisio Boscoverde or Lindau-Reutin https://de.wikipedia.org/wiki/Grenztarifpunkt#%C3%96sterreichische_Grenztarifpunkte_(gegen_den_Uhrzeigersinn)
Ok, that means when I live in Austria and used already inbound and outbound, I can travel from a neighboring country nevertheless. For example switzerland to france and from france back to switzerland. I just need a tickt from austria to the border of switzerland, is that right?
Thank you so much!
That sounds perfect, thank´s to all!