If your house telephone and Internet wiring are from Centurylink, this modem will not work, you need the C4000LG even if you no longer have a telephone connection. You can determine this by looking at the cable connected from the wall outlet to the current modem's DSL port. If it only has 4 leads you need c4000lg, c4000xg will not fit. Almazon doesn't show a picture of the back of the xg model so you can see what the connector looks like.
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