If the Do Not Disturb mode is activated on the Samsung device, calls are automatically muted, but the mode can be set to allow repeated callers. If a caller calls the same number again within 15 minutes, the call is acoustically allowed.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Notifications
Step 3:  Tap on  Do not disturb
Step 4:  Tap on  Allow exceptions
Step 5:  Enable or disable  Repeat callers
  1. Open the Settings
  2. Tap on Notifications
  3. Tap on Do not disturb
  4. Tap on Allow exceptions
  5. Enable or disable Repeat callers

Samsung Instructions
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