As a French ATCO I'd say you take up the IAC chart and look at the altitude restrictions following the IAF. Since there only is the G/S capture at 2500ft, you can descend until 2500ft at convenience according to the rules for direct arrivals (and not STARs), which means you do not get below the MSA, inside the 25NM sectors centred on CAV. And if you're further than 25D from CAV, then it's FL80 minimum.
If there had been a level restriction at KELON on the chart then you would have had to stop descent at that level (or adjust descent rate to be above it at KELON...).
Radar vectors are what they are, that is to say headings to follow. If on a direct to a fix, it's no longer considered vectors. Since you're not on a specified route, the ATC will clear you at or above the minimum safe radar altitude of the sector, which usually is lower than en-route charts.
But in doubt, ask over R/T...