SIM switching to second sim automatically while calling at Airtel network

  1. Model Name: Asus Zenfone Max Pro M2
  2. Firmware Version: PKQ1.WW_Phone-16.2017.2007.094-20200705
  3. Rooted or not: Not
  4. Frequency of Occurrence: Always


When I am calling from 1st sim, only at Airtel network it switch to second sim automatically when 1st sim is set default for calling. 

Dual 4G is enabled and set sim 1 for calling.

Tried restarting phone and switching sim slots but nothing changed. 

In first place had reported to my network provider but they couldn't solve it.


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