we have COMDIAL Digitech model 7714S. When people call our office and select an extension, they used to hear a local radio station play while that extension was ringing. The same radio station would come on when a caller was placed on hold. The radio station has gone away and the caller only hears silence. We would like to get the radio station back or set the phone so the caller at least hears a ring instead of silence while the extension they selected is ringing. Can anyone help me?