Panasonic KXTG7873 - Manual (Page 27)

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 22.
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.
For assistance, please visit http://www.panasonic.com/help 27
Making/Answering Calls Using the Handset
TG78xx(en)_1210_ver101.pdf 27 2012/12/10 21:19:27