AT&T MLC-6 Installation And Troubleshooting Manual page 13

The handset does not need to be located with the base except for
charging. For best coverage, place the base in a central location,
away from concentrations of structural metal such as steel and
aluminum or reinforced concrete. Use the handset at another desk
or while moving about your work location.
For indoor use, place the base so that walls do not block the base
from the area where the handset will be used. (See the figure
below.) Intervening walls
Poor Base Location
(Indoor Use)
For outdoor use, place the base near a window facing the outdoor
area where the handset will be used. (See the figure below.) Do
not install the base where it will be exposed to direct sunlight.
If you have questions about the installation of your cordless
telephone or the location of the base, refer to "Troubleshooting" or
call the AT&T Helpline at 1 800 628-2888.
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reduce the phone's range.
will
Optimum Base Location
(Indoor Use)
Optimum Base Location
(Outdoor Use)