18.9 NO DIALTONE
It means exactly what it says. Someone else may be using another telephone on the same line. You also get this error if there is no phone line plugged into the modem, or if the phone line is somehow broken. Try plugging a real telephone into the phone cord used by the modem. Check it for a dialtone.
If for some reason your modem doesn't detect a dialtone, then you can force it to dial anyway by putting X3 in the init string.
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