Contact your NI sales rep, or NI tech support at ni.com/ask to find out the answer to your question, if noone else here can help.
I have experience with DSC/BridgeVIEW, but unfortunately, didn't really get into the detail of the OPC server to be able to help.
Also, there is a thread specifically for DSC. Post your question there and you may be able to get a more accurate and quicker response.