Website phone numbers?

Question

CMS

Hello!
I administer automatic telephone exchanges for several dozen projects. A huge number of fake calls come in: scammers, telemarketing, etc. I wondered how to make a website as a hobby, ala don't pick up the phone.
What is the best way to implement it? First, as I understand it, in any case, you will have to add all the numbers of the Russian Federation there ... Do you have any ideas at all? ;))