[Win Server 2012] How to connect RemoteDesktop DeviceCAL z UserCAL licences?

Hello

We ordered 3 licences "WinRmtDsktpSrvcsCAL 2012 SNGL OLP NL DvcCAL".
After a while I read about complications with that kind of licences. UserCAL licences are better for us. We can order next licences, this time "WinRmtDsktpSrvcsCAL 2012 SNGL OLP NL UsrCAL".

We have only one Windows Server 2012 with Remote desktop services.
I have some questions about using 2 types of licenes at once.
Can one terminal server use both types CAL: DeviceCAL and UserCAL at once?
Or do I have to use second Windows Server to use UserCAL?

Best Regards
Tom