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That information (phone calls log or register for a whole month) is not available on your Panasonic phone, I am sorry to have to say, since it does not have that large a memory capacity (and does not log incoming calls in that fashion, only some special numbers such as the Blocked Numbers list.)
To get that information, I advise you to contact your phone company, or phone line service provider.
(If you need the right number, please tell me what your phone company or phone line service provider name is, and I will give you the right number.)