I have the 3cxPhone version 12.5.44288.0 for windows and am running windows 10 on the machine it's running on. The program only lets me make a call when you first start the application. Once you dial that first call then hang up it wont let you dial again. When you do get the rare chance to dial out there is no audio at all. The audio for the button press plays and i've checked all audio drivers and audio settings and everything there is peachy. It just wont play audio on calls. I've scoured the internet trying to find some kind of solution and im coming up empty handed and the guy who set up the phone system basically set up the phone program sent me the provisioning file and said "Good luck finding it out." So i figured its time to consult the all mighty forum.