This User Box is used to store a fax document that cannot be sent because the recipient is busy. Once you have opened the User Box, you can select a fax document stored in the User Box to preview, print out, send, or delete it.
Fax transmission is attempted for the number of times set by Auto Redialing function. If those attempts have failed, the fax document is stored in the Fax Retransmit User Box.
Auto resending (Auto redial) (Here)