Yes, that's a technically feasible option. Under the STIR/SHAKEN model that the French have adopted, starting in 2025, France will be required to block all international calls that haven't been validated. But that approach wouldn't promote good relations with our neighbour to the south.
However, the technical means do exist. Without responding once again to questions that have already been asked, I'd definitely invest in that area if I had other resources at my disposal. We'd have to see what can be done across networks to roll out systems that can detect those calls in order to control them more effectively. That would allay a lot of fears.