There should be three ports the phone line can plug into,
one will be occupied by the machines headset,
there should then be a LINE and an EXT port.
Make sure the phone cord is plugged into the LINE port.
If it is and still no dial tone try a different phone cord and also try hooking up a phone to the jack you're trying to plug the machine into to make sure it's live.
If a new cord doesn't work and a phone can get a dial tone then it's possible the board that has the jack could be bad and would need to be replaced by a service technician.
If it comes to that here's the part number you'll need to have replaced (you can try to google it to get an idea of the cost of the part, I suggest not trying to do the repair yourself and to actually take it to a repair shop though)
NCU PCB:
LG3190002
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