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Hi and welcome to JustAnswer, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially, would you consider an experiment?
Temporarily disconnect the Panasonic KX-TGF382M's telephone wires and unplug its AC wall adapter.
Then call your home/landline number using your cellphone.
Determine if VoiceMail would still answer.
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Yes on the phone call after "...a couple of minutes..." and the above experiment have been done.