The CloseRxIvrChannel API procedure allows application software to close a previously opened phone line receive IVR channel. You must close all receiver IVR channels before your application terminates. Receive IVR channels can be closed any time.

The OpenRxIvrChannel API procedure allows application software to access phone line received audio data. The primary purpose is to allow speech recognition or other special signal processing of received audio data. The audio data from this interface can be used for whatever your application demands.