This User Box is available when this machine is used as a fax relay machine.
When you send a fax to the relay machine using the relay distribution function, the relay machine sends the received fax to all recipients pre-registered in the Relay User Box.
Using the Relay User Box, you can reduce the total communication cost via the relay machine, for example, when you want to broadcast to distant places.
To use this machine as a fax relay machine, you need to register a Relay User Box and specify fax recipients.
Sending after Specifying a Relay Machine (F-Code TX) (Here)