L179 eastbound via Saski is available to traffic as long as it files FL 110 or below but only if you are inbound to a handful of destinations (cant remember what they are off hand there is about six or so in the brussels area). They will show a C3 exit code on the TC radars, if you dont meet these criteria it will throw out a route via redfa normally with a AM code on the radar.
So the controllers will route you according to what in fo they have. If you meet all the parameters no coord with brussels is required if you dont its not impossible but we have to check its ok with Brussels.
Clear as mud.......
probably...