The FAX_ENUM_DEVICE_RECEIVE_MODE enumeration constants describe the receive mode for a fax device.

 typedef  enum 
 {
   FAX_DEVICE_RECEIVE_MODE_OFF = 0,
   FAX_DEVICE_RECEIVE_MODE_AUTO = 1,
   FAX_DEVICE_RECEIVE_MODE_MANUAL = 2
 } FAX_ENUM_DEVICE_RECEIVE_MODE;

FAX_DEVICE_RECEIVE_MODE_OFF: Do not answer incoming calls.

FAX_DEVICE_RECEIVE_MODE_AUTO: Automatically answer incoming calls after the specified number of rings.

FAX_DEVICE_RECEIVE_MODE_MANUAL: Manually answer incoming calls.