Honestly, this is what I wish Android's call screen was. Call screen starts by explaining itself, which I think could waste time, can be confusing, and possibly is insulting. Compared to a quick "Hey please leave a message after the beep."

I want to be able to send basically all unexpected calls to the screening, and only pick up if it's something I want to respond to right now. It feels rude to, eg, send a neighbor to a call screening service when I definitely have their number but don't want to drop what I'm doing to hear them complain about something.