1. A fax back confirmation will not be provided should the original fax fail before leaving the sender
2. If the CLIN* is blank a fax back will not be sent as the system will not know where to send the fax back to
3. If the CLIN* contains the wrong number, an attempt to send the fax will be made but will not be received
4. If your fax line is busy; the service will try 3 times to send a fax


*calling line identification