Before installing custom volte roms device should have volte official rom.
These roms are as like OTA updates not the full firmware roms.
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To get volte, you should have to flash volte official rom according to your device and variant but at your own risk.
You have to flash Indian volte official rom.
What is your variant?
My variant is a6020a46 2gb
yes my varient too is a6020a46 2gb but bought from dubai ,when my phone was on stock rom there were no volte updates for the phone.
Now how to install volte official rom??
should i make a backup?
please explain the procedure to install volte official rom full firmware and please provide links too..