The manual, which can be found at:
http://www.home-electronics.net/ge/pc/IB/25952EE1_IB.pdf, reads:
4. Place the handset in the base cradle. The charge/in use indicator turns on,
verifying the battery is charging. The unit will take 20 seconds to register
and verify its security code. READY shows in the display.
NOTE: In case of a power failure, the handsets may display
UNAVAILABLE when the TALK/CALL BACK button is pressed.
You must then place all handsets on the main base cradle
for 20 seconds to re-register.
That should reset your handsets. Hope this helps :) Thank you very much.
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