We can set the call waiting notification on the Xiaomi smartphone in three different ways: either the notification tone is played twice or continuously, with the third setting playing the call waiting tone and vibrating twice.

Android 10 (MIUI 12.0)
Step 1:  Open the  Phone app
Step 2:  Open the  Settings
Step 3:  Tap on  Advanced settings
Step 4:  Tap on  Call waiting notification
Step 5:  Choose  Play notification sound continuously ,  Play notification sound twice  or  Play notification sound and vibrate twice
  1. Open the Phone app
  2. Open the Settings
  3. Tap on Advanced settings
  4. Tap on Call waiting notification
  5. Choose Play notification sound continuously, Play notification sound twice or Play notification sound and vibrate twice

Xiaomi Instructions
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