If we have activated a restriction on calls in Do Not Disturb mode, we can specify whether to allow repeated calls from the same person within 15 minutes are transferred or not muted.

Android 10 | EMUI 10.0
Step 1:  Open the  Settings
Step 2:  Tap on  Sounds & vibration
Step 3:  Tap on  Do Not Disturb
Step 4:  Enable or disable  Repeated calls
  1. Open the Settings
  2. Tap on Sounds & vibration
  3. Tap on Do Not Disturb
  4. Enable or disable Repeated calls

Huawei Instructions