For the KX-TG5672, you should press and hold the Intercom button until the charge indicator flashes. Then press the button to assign the handset # 1, 2 or 3 (keypad 1, 2 or 3). Then press OK on the handset and wait for the handset to beep. These steps must be done within a minute from when the charge indicator flashes. It's best to have the base and the handset close together when you register the handset.
Panasonic has the manual for the TX-TGA560 available here:
http://service.us.panasonic.com/OPERMANPDF/KXTGA560-MULTI.PDF . (This manual covers both the KX-TGA560B and KX-TGA560M.) The manual for the KX-TG5672 is available here:
http://service.us.panasonic.com/OPERMANPDF/KXTG5671S.pdf .
If you still have a problem, try removing the battery from the handset and disconnecting the power cord from the base (from the wall and the base itself). Wait a few minutes and then reconnect the power cord and the battery for the handset. (Make sure that the base has power and the adapter is warm.) Then try registering again.
I hope this helps.
Cindy Wells
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