I'd like an option similar to the old answering machine / secretary screening for unknown callers:
1. A voice assistant says to the caller "may I ask who's calling [records response] and what is your call in reference to [records response]?"
2. Siri announces the call to me if the phone is not set to Not Disturb mode.
3. I accept the call or decline. If I decline, Siri gives the caller the option to leave an additional message.
TL;DR Caller states their name and business before I pick up.