Sharp MX-7001 - Manual (Page 709)

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The following settings are for regular polling memory
using the Public Box.
Set Fax Polling Security
When the memory polling function is used, this setting
determines whether any machine will be allowed to poll
your machine, or only machines that have been stored in
your machine.
Add New
When the Polling Security Setting is enabled, use this
setting to store (or delete) the fax numbers of the
machines that are allowed to poll your machine. The
stored fax numbers are called passcode numbers. Up to
10 passcode numbers can be stored (maximum of 20
digits each).
Passcode Number Key List
This shows a list of the stored passcode numbers. A
number can be selected to delete it.
Fax Polling Security
Note that these settings do not apply to F-code polling
memory.