Thanks for the replies Jimates and Felix.
Jimates...The Phone Port Configuration Summary shows Phone 1 as SP1 (for all) and Phone 2 as not configured (which makes sense, as I did not configure it yet.
Felix...I didn't set up a separate provider yet, but at this point does it matter? I would prefer both the fax and this phone to be the same number. Faxing so far via Google Voice has been seamless. I can send and receive (both regular and e-faxes). At the moment, I have the Obi202 Tethered in my office and the phone and separate fax located in my wife's office via a splitter-jack.
It could well be the wiring. It is an old house with a flat roof and no basement or crawl space, so it is difficult to rewire. I like your idea about trying the fax in the tethered room...but it is waaay too heavy to move there. But I did move the phone there. The phone will send and receive calls when directly tethered to the Obi...however, the Fax no longer rings, once the Obi is "untethered" from the wall jack and instead hooked to the phone.
My thought...purely uneducated...is the the Obi202 needs to be tethered directly to the wall jack for it to properly "fuel" the remaining wall jacks...and it just can't do it wirelessly
Thoughts?