3CX Phone System is install on server with Hyper-V - Win Server 2008 64 bit. If "PBX delivers audio" is disable everything work great. If "PBX delivers audio" is able trouble with voice is appear in 3CXPhone 6. We can't hear voice in one way. In Bria everything is good. We try to do this: http://www.3cx.com/forums/issue-audio-delivery-xp-sp3-amd-64-x2-4000-investigation-20204.html but nothing is change. As we think problem in 3CXPhone. It's don't work with Hyper-V. Can u help?