CenturyLink is a major ISP
In Seattle, Washington. Please add service for their standard cable box in this major American city. IPW8000 - if I can't get it to work i'm sending my 500 back. Thousands if not tens of thousands of other people in Western Washington are about to open SlingBoxes for the holidays. Add this model ASAP!
I assume you have already done a proper Forum Search for your model number in case other people have already answered your question ?
If so and that didn't help then check out this thread: https://community.sling.com/message/10363#10363
Come back if it that doesn't help either.