Well, thanks but I didn't want to bump up this question by mentioning that I've found a solution already. I discovered a library for this device that allows me to communicate with it and this DLL actually handles the communication over USB for me. Right now, I can already tell the phone to make a call, disconnect it and a few other things. Just have to find a better library for all this CSTA-stuff, though. What I have now is just C++ code and I prefer to write my code in Delphi.