I read through the thread several times but still have trouble understanding the problem. So I go from scratch.
Test your home wiring. You probably need a phone jack tester to test the voltage of the phone wiring. You can get it at most of hardware/electronic store(Home Depot, Lowe's, Radio Shack, Fry's to name a few) and there is a good change that you can get it under $10.
Disconnect your TW voip and Telo from the house wiring, and test every wall jack in the house. The line should be clean, i.e. no voltage present. You probably need a Line1+Line2 splitter to test both lines of your house wiring. If there is any voltage on the house wiring, this is the source of the problem.
Next connect your TW voip into the wall jack and do the test again to see which jack have the dial tone, which is not. You might want to do this twice(for both line 1 and line 2--so two line1+line2 splitters are needed)
If there is any problem with the house wiring, you need to fix them first.
At the time of activation, did you choose to intergrate your land line to work with ooma? This is important, if you pick the wrong option, ooma will not work. I know you had called CS and this setting might be reset, however I do not get the clear picture of this situation.
Call CS to inquiry about the land line intergration status. You should emphasize that:
* You want to keep your number, i e. you do not want to port your number or might to choose to do so later.
* You want to have your land line rings through ooma and serves as a backup when ooma is down.
* You don't know if you choose the right option when activating the ooma unit. (I know, it was confusing for me as well.)
and ask CS to help you to choose and retify it if you picked the wrong option.
This will also answer your original question, you can test out ooma with this setup without the hassle of porting your number over. Later if you are happy, you can decide to port it or just drop it and return the unit.
read my post in this thread viewtopic.php?f=2&t=4399&start=20
for instruction to install the telo with minimum of problems.
worst case scenario, you can feed the TW dial tone to Line1 and Telo to Line 2 of the house wiring during the transition period.