“How do I register phone line with Optimum? I read several comments that this modem works with optimum despite the manual saying it does not. I have plugged A phone into the modem and still have a blinking telephone symbol.”

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• I have Comcast/Xfinity and had no problem. Try calling Optimum they may have to do something on their end.

  Answered by TerryN 5 years ago

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• did you call your ISP to activate the modem?

  Answered by kevin 5 years ago

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