I just went in the TWC box and unplugged all the phone wires there. Came inside and checked the phone lines... all dead!
Except... where the cable line comes in, a phone line comes in, too. It's got a splitter, with one phone line going to my modem and the other to a phone. That phone still works.
How do I disconnect it? Or... do I even have to? Did I need to unplug anything in the TWC box?
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Your cable company should have disconnected your house wires from the telephone company when they setup their cable phone service.
If you could get everything the way it was when you found it....
Here is what you need to do.
The cable modem has a phone cord connected to a walljack. You connect that phone cord from the cable modem. All your phones connected to your walljacks should be dead when you do this. You take that phone cord and connect it to Ooma's "phone" port. Your phones should come back to life with Ooma dialtone.
So I can keep the splitter? With one line going to my Telo and the other to my phone?
And... can I get rid of the splitter, replacing it with a regular single jack (connected to the Telo)? It's sort of hideous the way it dangles out of the receptacle.
If so, that means your modem and the phone on the "splitter" is using the same wire pair so you can replace the wall plate with one that has cable coax as well as a phone jack.