Why is my iPhone silencing calls?

"Why is my iPhone silencing calls?: During the day my iPhone 12 Pro with iOS 16.1.1 does not have any Focus active but calls from phone numbers that are not in my contacts list are silenced."

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Troubleshooting Filtered Numbers:

Are you using any filters on your iPhone? If so, disable them.

This is irrespective of Focus/DND.

You may turn on/off Silence Unknown Callers, go to Settings > Phone, then scroll down, tap Silence Unknown Callers, and turn on/off the feature. If ON, calls from unknown numbers are silenced and sent to your voicemail, and appear in your recent calls list.

Detect and block spam phone calls - Apple Support (IN)