Note 4 N910T3 , Root and WIFi Calling?

Hi everyone,

So I just got a new Note 4 about an hour ago, and now reading forums realizing that they are not all created equally.
Mine is T3 that came with 5.1.1.
Trying to root this thing, but unless I am missing something it looks like if you root you loose WIFI Calling?

Is there any method to root and keep the feature currently?? I already flashed twrp if that helps. WIFI calling is vital for me unfortunately(
The same time I obviously need root.

Please help!
Tnx