After the fax machine plugged in, to answer the phone, then fax, but it's not available, how the story ah?

Users questions:After the fax machine plugged in, to answer the phone, then fax, but it's not available, how the story ah? ? Fax back with two jacks, a written LINE is the line right, the other EXTITEL what ah? ?
Experts answer:line is connected outside of, EXT port is connected extensions. YouReversed the interface. References: www.bjsogo.com
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