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