Canon MultiPASS C50 Software User's Manual page 158

Manual/Auto Switch
To prevent missing incoming documents when the C50 is set to
manual receiving, you can set the unit to automatically answer the
phone and switch to automatic. The unit can receive the incoming fax
after the specified ring time (the number of seconds you specify).
Answering Machine Mode Options
You use this option only if: you set the receive mode on the Receive Fax
tab to answering machine mode, and your fax sender may be using a
fax machine that does not emit a send fax signal.
Select this option to have the C50 automatically receive a call as a fax
call if a send fax signal is not detected for the number of seconds you
specify.
Clear this option to have the C50 remain in answering machine mode
even if no send fax signal is detected. If no sound is detected by the
C50 (such as the caller speaking to leave a message), the answering
machine disconnects.
Remote Receive
You select this option so that you can set the C50 — with the telephone
handset or from a telephone extension — to receive a fax if an
incoming call is ringing on the C50. If you select this option, you must
assign a remote identification number that signals the C50 to receive
the fax.
Remote Identification Number
If the Remote Receive option is selected, you assign the identification
number you will use to set the C50 to receive a fax.
Chapter 8 C50 Setup and Other Utilities in the Desktop Manager 8-15