@velo27 BT calling on Meizu Pro 5 never worked correctly. Not even back on Canonical 15.04 Vivid build. There were numerous bugs reported regarding this, but no one seems to be able fix it until now.
I heard that on Oneplus One is BT calling working correctly at the moment, don't know about other devices.
Would be great, if people share their experiences with BT calling.
Fingers crossed for someone to be able to fix this issue on UT.