If this doesn't give you the answer, it may give you some clues. If your electricity goes off, would you check your neighbor's plumbing? Well, in this case, the answer for me was just as weird.
I first tried the "Silencing Unknown Calls." But that wasn't the problem.
For me, I noticed it was happening for all but one phone number, and only at home. Furthermore, it impacgted my hearing calendar alarms and hearing text messages.
Finally I remembered a weird setting, but NOT on my phone. It was the NOTIFICATIONS on my MAC! It required the right combination of settings for Facetime, and Notifications since Focus, when I used Airplay. (If that's not the case, please still read this--you will at least go to the right places to look). Check notification settings on all devices. This was a case of the Law of Unintended Consequences, requiring multiple factors.
I spent hours with Apple and my carrier. I don't blame anyone for not figuring this one out. The one phone that got through had a different ring tone. It wasn't the ring tone but I set it up as a favorite. I thought it had to do with Focus/DND. And that's when I realized it was because I was using AIRPLAY on my Mac. I then found each of the following and changed one at a time.
You can look at this and get an idea of what you may have to change.
In the Mac, go to System Preferences and check the following. I changed to the BOLD.
- Notifications & Focus/Focus: Share across devices. (No)
- Notifications & Focus/Focus, then select Options: Allow Calls from (Everyone/All Contacts, etc.)
- Notifications & Focus/Notifications (at bottom): Allow Notifications When mirroring or sharing the display (Yes)
- Notifications & Focus/Notifications/Calendar (left): Allow time sensitive alerts. Yes
- Notifications & Focus/Notifications/Calendar (left): Play sound for notifications. Yes
- Notifications & Focus/Notifications/Messages (left): Allow time sensitive alerts. Yes
- Notifications & Focus/Notifications/Messages (left): Play sound for notifications. Yes
Repeat for other applications. Do not pass Go. Do not collect $200. Your miles may vary. Not valid in Alaska or Hawaii.
Check out notification settings on all your Apple Devices.