I have predefined DR(Digital reception) in system, where i want to add prompt file name at real time. Getting started with C# for CFD might cause some headaches especially when someone’s not writing a lot programs. I have check API mention in Call Control API and my head get spinning. Here is my flow : 1) Call come to system go CFD. 2) On the basis of Caller ID I will fetch .wav file name from SQL connection 3) file name fetched from database I have to add or overwrite it in DR Prompt feature(let's say 8001 is my DR). 4) Route call to 8001. Like this I have 1000 caller ID and 1000 IVR. I need help for point 3. I think it is possible, It would be gr8 if someone can help me with 3cx methods I have to use to accomplish this. regards, goga.