here are some that i found from a google search (with keywords phones that include call screening) https://blogs.which.co.uk/technology/phones-3/the-latest-call-blocking-home-phones/
25 numbers is ridiculously low. It doesn't cost Comcast anything to bump it to 100 or 1000. With the huge increase in robocalls in the last year, why doesn't Comcast care enough to raise the limit? Do they make money off of robocalls that are routed to their customers? Do they make money off of more sophisticated call blocking features? Clearly there is some incentive keeping them from helping their customers deal with this cancer.