hi, i copied the code from msdn,but it has an error.please help me. Thank you for any help in advanced. Dim objCall As ITBasicCallControl Dim objStreamControl As ITStreamControl Set objCall = callInfo Set objTerminalSupport = WorkingAddress Set objTerminal = objTerminalSupport.GetDefaultStaticTerminal(MEDIAAUDIO, TD_RENDER) //Here type mismatch error occured. Set objStreamControl = objCall