“Can I add an existing phone that I have to this unit or must it be a special unit to tie in to the expandable phone system.”

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• We had Panasonic phones, just added these , now have 7 phones.

  Answered by Squirrelly 4 years ago

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• This is a standalone unit and it cannot be connected to another Phone System.

  Answered by Panasonic Team 4 years ago

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