It doesn't play any kind of greeter. Seems to be an online database of spam numbers, I receive calls marked as Spam with a big red exclamation mark. it's not as simple as blocking any calls that aren't already contacts. I could never use that professionally.
tantalor|1 year ago
https://support.google.com/phoneapp/answer/9118387?hl=en
> Call Assist answers the call and asks who's calling and why