Panasonic KX-TG7842C Operating Instructions Manual page 28

Making/Answering Calls Using the Handset
n When 2 or more handsets are registered:
When the unit rings, use a handset which is
not supplying power to the base unit. For
the operation, please see "Answering calls",
page 23.
R Do not use or lift the handset which is
placed on the base unit during power
back-up mode.
Note:
R During a call with the handset placed on the
base unit (power back-up mode), the call
may be disconnected if you touch the
handset. In such case, try to call back.
R The range of the base unit is limited during
a power failure. Please use the handset
close to the base unit.
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TG78xxC(en)_1221_ver013.pdf 28 2012/12/21 11:21:30