In addition to the normal call rejection, we can also reject incoming calls with a short message, in which case the incoming call is rejected and an SMS message is sent with the information that we will call back the caller, for example.

Android 10 (EMUI 10.0)
Step 1:  Tap on  Message
Step 2:  Choose a  quick response  to reject the incoming phone call
  1. Tap on Message
  2. Choose a quick response to reject the incoming phone call

Huawei Instructions
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