Making an extension telephone available to receive faxes
With this setting turned on, you can alert the device to pick up the incoming fax call by
pressing 1-2-3 sequentially on the telephone keypad (in tone-dial mode only). The default
setting is On. Turn this setting off only if you use pulse dialing or if you have a service from
your telephone company that also uses the 1-2-3 sequence. The telephone company
service does not work if it conflicts with the device.