Audio problem

[kd2om]

I have installed the server software, as well as the radio control software. As long as I leave the VoIP software disabled, I can hear audio from the transceiver when using the remote software on a PC. If I enable the VoIP software I can't hear audio nor can I talk over the radio. I also can not hear audio on the Android version of the remote software.
I am just using the USB cable for both audio and control. Must I use an audio cable from the radio to the PC where the server is?
73
Steve KD2OM