If the "Do Not Disturb" mode is activated on the LG unit, by default no incoming calls are heard. The settings allow you to activate the "Repeated Calls" function. If the same caller calls again within 15 minutes, the second call is not set to silent and is therefore audible.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  Sound
Step 3:  Tap on  Do not disturb
Step 4:  Tap on  Select priorities
Step 5:  Enable or Disable  Repeated calls
  1. Open the Settings
  2. Tap on Sound
  3. Tap on Do not disturb
  4. Tap on Select priorities
  5. Enable or Disable Repeated calls

LG Instructions
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