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# Notes on Using IP-Fax

This section describes notes on using IP-Fax.

- You may not be able to send to a firewall-protected network.

- You cannot use telephones on a LAN.

- If there is a power failure (the main power switch is turned off) or the machine is unplugged for about one hour, all the documents stored in memory are deleted. As soon as the main power switch is turned on, the Power Failure Report is printed to help you check the list of deleted files. Simply turning off the power by pressing the operation switch does not delete stored documents. See “Turning Off the Main Power / In the Event of Power Failure”, Troubleshooting.

- IP-fax communication might not be available if connection is by wireless LAN.