Canon MultiPASS C80 Software User's Manual page 274

Remote Receive
You select this option so that you can set the MultiPASS printer, from a
telephone extension, to receive a fax if an incoming call is ringing on
the MultiPASS printer. If you select this option, you must assign a
remote identification number that signals the MultiPASS printer to
receive the fax.
Remote ID Number
If the Remote Receive option is selected, you assign the identification
number you will use to set the MultiPASS printer to receive a fax.
8-14 MultiPASS Printer Setup and Other Utilities in the Desktop Manager Chapter 8