In addition to the exception that calls from selected contacts or contact groups (favourites) on the OnePlus smartphone can be allowed in Do Not Disturb mode, another option can be checked or enabled that allows repeated calls from the same phone number within 15 minutes, if the call is urgent or even emergency.

Note: This bypasses the function and puts the call through with a ring tone and vibration.

Android 10 (OxygenOS 10.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sounds & vibration
Step 3:  Tap on  Do Not Disturb
Step 4:  Tap on  Calls
Step 5:  Enable or disable  Allow repeat callers
  1. Open the Settings
  2. Tap on Sounds & vibration
  3. Tap on Do Not Disturb
  4. Tap on Calls
  5. Enable or disable Allow repeat callers

OnePlus Instructions
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