Mi 3 MSM8974PRO-AB -- VoLTE possible?

[digitized01]

Hello,

I've Mi 3 with MSM8974PRO-AB chipset which, I suppose, can support LTE and VoLTE.

The latest MIUI with Marshmallow doesn't even show LTE in network options. Is there any hack or custom firmware like CM which can enable VoLTE?

Any help, please?

Thanks!