Canon MultiPASS C50 Software User's Manual page 157

Ink/Toner Saver Mode
You select this option if you want to print documents in the Desktop
Manager using a reduced amount of toner, thereby saving printer
toner. When using this option, the printed document may appear to
be less bright or contrasted.
Listen Time Before Ringing
When a call is received, the C50 checks to see if the call is from a fax
machine or a telephone. If your C50 does not have enough time to
detect the fax tone, it assumes the call is from a telephone. You use this
option to set the appropriate amount of time to allow the C50 to check
for the type of call.
Ring Time
When your C50 is set to receive both fax and telephone calls, it rings to
inform you of an incoming telephone call. If you do not pick up the
handset within a certain amount of time, the C50 stops ringing. You
use this option to set the appropriate amount of time the C50 should
ring.
Ring Tone
You set the volume level of the ring tone.
Default Action If No Answer to Telephone
You set this option to Receive if you want the C50 to handle an
incoming call, detected as a telephone call that is not answered, as an
incoming fax. If no fax is received, the line is then disconnected. If you
set this option to Disconnect, the C50 automatically disconnects the
unanswered call, without switching to try and receive a fax.
8-14 C50 Setup and Other Utilities in the Desktop Manager Chapter 8