Just no. Almost nobody else in the western world has this problem. How? Regulation. In Germany, if you get reported for unsolicited calling, the Bundesnetzagentur will come to you and give you a very hefty fine, per violation. Problem solved. I remember exactly four unsolicited calls in my life, two of them on a number which was published in a phone book for 15 years.
Spam calling is not something were there is net value created for society so we need an elaborated discussion of what is ok and what is not (like e.g. paid universities). It just sucks. Make it illegal, and then actually enforce that. The idea of creating a million dollar industry to create a telemarket arms race is...not good.