Tunnel audio chat over ssh

I'm running a HelpDesk for internal call center employees. Right now, we can chat with employees over our web portal and remote-control their Linux Mint workstations via VNC over a secure SSH tunnel. All employees have headsets in conjunction with their jobs, and I'd like to find a way to initiate voice-chat with them over SSH in order to better aid in remote support. After some googling, I found two commands: arecord -f cd -t raw | oggenc - -r | ssh admin@REMOTEUSER mplayer - and dd if=/dev/dsp | ssh -c arcfour -C admin@REMOTEUSER dd of=/dev/dsp Neither of these commands (with proper credentials) seemed to work in my testing, however. Does anyone know how I can establish a live voice connection over SSH to an employee's machine? I have root access to the remote machines, so that won't be a problem. **UPDATE:** I tried hosting a Murmur server on my local network. Opening Mumble over SSH does work, but I can't seem to get Mumble to launch minimized (or without the GUI). Are there any other voice-chat solutions which I could host over LAN and hide the employee's chat GUI?