Question about Panasonic Panafax UF-9000 All-In-One Laser Printer

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Communication code 404

I ried to send a fax, but get the message did not go comm 404. What does it mean. Where is the problem? On my end or on the receiver?Thank you

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It is on the receivers end, saying either the modem is defective or they diconnected the line during transmission

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