@xN31 Thank you very much for the voice. Yeah, technically nothing was in the way of using VOIP. I thought about increasing bandwith, but only to decrease network lag, did not think it would also solve this. Will try it in the following days.
As for spatial sound, I think it is without a doubt mandatory to work with 4.16 since with the updated audio engine. The only thing I lost a little by me latin here is the 3 different spatialized options we have: Unreal, Steam or Oculus.