private TAPI3Lib.TAPIClass m_tapi=null; 

private TAPI3Lib.ITAddress m_address=null; 

private TAPI3Lib.ITBasicCallControl m_call=null; 

ITMediaPlayback pMediaPlayback; 
//....

private bool SelectTerminal() 
{


try 
{


ITTerminal pFileTerm=null; 

ITTerminalSupport pTermSup=null; 
pTermSup=(ITTerminalSupport)m_address; 
pFileTerm=pTermSup.CreateTerminal(

TapiConstants.CLSID_String_FilePlaybackTerminal, TapiConstants.TAPIMEDIATYPE_AUDIO,TERMINAL_DIRECTION.TD_CAPTURE); 

if(pFileTerm==null) 

MessageBox.Show("terminal is null"); 
pMediaPlayback=null; 
pMediaPlayback=(ITMediaPlayback)pFileTerm; 

object[] s=null; 

if(m_strFileName.Length<1) 
s=new string[]{"c:\\2.wav"}; 

else 
s=new string[]{m_strFileName}; 
pMediaPlayback.PlayList=s; 


ITCallInfo ci=(ITCallInfo)m_call; 

ITBasicCallControl2 cc2=(ITBasicCallControl2)ci; 
cc2.SelectTerminalOnCall(pFileTerm);

m_control=(ITMediaControl)pFileTerm; 
}


catch(Exception ex) 
{
MessageBox.Show(ex.Message); 
}


return true; 
}

//....

private void OnConnect() 
{ 

m_control.Start(); 

}