Canon MultiPASS C545 User Manual page 109

DRPD
Use this mode if you have subscribed to a Distinctive Ring Pattern Detection
(DRPD) service offered by some telephone companies. By subscribing to such
a service, you can have several fax and telephone numbers for your MultiPASS
using only one telephone line.
Once you have decided which mode you want, set the mode either through the Fax
Setup Utility (see the online MultiPASS Desktop Manager Software Guide) or
through the operation panel (see the online Standalone Fax Manual). You can
change the mode at any time.
Chapter 5 Receiving Faxes
5-3