Friend have no sound when joining my hosted game

If I host a minecraft windows 10 edition server my friend have no sound beside music and setting sound. If my friend host a minecraft windows 10 edition server I have no sound beside music and setting sound. Single player is fine problem is only in multiplayers.
My PC: intel duo core E8500 CPU @ 3.16GHz / 4 Go ram / Windows 10 NVidia Geforce GTX 460 SE

My friend PC: I7-4790 CPU @ 3,60 GHz / 3,60 GHz / 16 Go ram / NVidia Geforce GTX 970