Network doesn't support VoLTE for Mi Max (Hydrogen)

Network doesn't support VoLTE for Mi Max (Hydrogen) //mokee-discourse.s3.dualstack.ap-northeast-1.amazonaws.com/optimized/2X/1/15c7ce2b6f4d4bfa65230e7a8b5ef6beb28c49ec_2_576x1024.jpeg
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VoLTE network support in Xiaomi Mi Max (Hydrogen) is very important for international users. It is the problem which stops international Mi Max users from using Mokee OS. The attached screenshot has an example of VoLTE.