How to play a .wav file with TAPI 3 in C#?

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C#

phone

modem

Hi, I am working in a phone system in C# using TAPI 3 library and I am looking to play a .wav file when called party answer the phone.

I found the following code, but I get an invalidcastexception in the line "myTerminalSupport = (ITTerminalSupport)ln;". "ln" is a TAPI3Lib.ITAddress type variable, which served to create the call previously.

Here is the code:

ITCallInfo ici = (ITCallInfo)bcc;
ITTerminalSupport myTerminalSupport;
myTerminalSupport = (ITTerminalSupport)ln;
ITTerminal myTerminalForPlayback = myTerminalSupport.CreateTerminal(TapiConstants.CLSID_String_FilePlaybackTerminal, TapiConstants.TAPIMEDIATYPE_AUDIO,
TERMINAL_DIRECTION.TD_CAPTURE);
ITMediaPlayback myMedia = (ITMediaPlayback)myTerminalForPlayback;

object[] filelist = new object[2];

filelist[0] = "test.wav";

myMedia.PlayList = filelist;

ITBasicCallControl2 myCallControl2 = (ITBasicCallControl2)bcc;

myCallControl2.SelectTerminalOnCall(myTerminalForPlayback);

ITMediaControl myMediaControl = (ITMediaControl)myTerminalForPlayback;

myMediaControl.Start();