Dell Wyse 5070 Skype for business problems

I am working to switch everyone in our call center over to the 5070 thin clients, they are currently using 7040s. I have set these thin clients up and can connect to the VMs and I can get everything to work as it should, except for Skype for Business. Now, I can send and receive text messages, but I can not make phone calls. When I attempt to call someone, the window opens for maybe a second, before closing. The same happens when I pickup the receiver or hit the speaker button to make a call. I hear the dial tone for a second before it shuts off. Any ideas?