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Error Message: You device is not recognized by your ISP

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Error Message: You device is not recognized by your ISP

I have a vontage modem (new, it was mailed to me yesterday), but I have been using vontage since 2008.  I have never had an issue connecting it to the cable modem (current modem is:  Arris, Surboard) and my telephone.  Just two month ago I was usng Spectrum as my ISP in SC.  I recently moved to GA and started using Xfinity (comcast) as my ISP.  Today when I pulled in my vontage modem to the ethernet port on my Arris modem (model: SVG2482AC) all the lights on the vontage modem came on correctly (intenet light and telephone light came on when I pick up the head set).  I turn on the phone and received the following message:  "Your ISP does not recognize this device."  How do I resolve this error?  Thanks