If the "Do Not Disturb" mode is activated on the Oppo-Smartphone, repeated calls of the same phone number can be allowed. The caller must call again within 3 minutes. By default, this function is deactivated under ColorOS.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Do not Disturb
Step 3:  Enable or Disable  Ring for repeated calls
  1. Open the Settings
  2. Tap on Do not Disturb
  3. Enable or Disable Ring for repeated calls

Oppo Instructions
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