Support For VoLTE

Kindly can anyone help in enabling VoLTE in Moto G 2015 XT1550 (stable Custom Rom). I'm using a sim that has support for VoLTE. Internet speeds are great but voice calls over the sim are not audible, as VoLTE is disabled. I've did a backup of build.prop. Waiting for a tweak to enable VoLTE. Thanks in advance !!

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