AT&T 2440 - Manual (Page 14)

TELEPHONE OPERATION
AT THE BASE
13
On steadily whenever
handset is placed
in base unit
charging cradle.
On steadily when line is being
used by a system handset.
Flashes when another phone
on the same line (parallel
extension) is in use.
On steadily when the
base unit is properly
plugged in.
Flashes when unit is in
Power Fail Operation.
Redial
Call the last number dialed from the
base. (Hold down for more than two
seconds to erase the redial memory.
You will hear a confirmation tone.)
Hold
Press to put a call on
hold. You cannot
hear your caller, and
your caller cannot
hear you. Press
H
or
K to
return to the call.