Please describe the issue in more detail. The dashboard for REF001 is here:
http://ref001.dstargateway.org/
Do you mean that you are connected to REF001 module C, and you see someone on this dashboard in call on module C, and you don't hear the call on your radio?
In this case, check if you see the call in your openSPOT2's call log on the Status page of the OS2 web interface.