For the benefit of those who followed this post, here's an update.
I went several rounds (of email) with OBi support regarding the OBiBT issues I was having. Most of dialog was of the usual (and irritating) variety: Is it plugged in? Is the phone within range of OBiBT dongle? And my favorite... Your Device Managment shows NO Dongle on your BT1 service (Translation: Your OBiBT is not working).
Really? Imagine my surprise!
Finally they acknowledged that the dongle was likely defective and asked me to return it. They indicated they would send me a replacement AFTER mine had been returned. I told them No Thank You and requested a replacement for both the OBiBT dongle and the OBi200 from Amazon. Amazon graciously responded that they would rush replacements out to me and asked me to return my "defective" units as soon as practical. Now THAT'S customer service!
I requested replacements for both because neither I nor OBi support(?) could determine which was defective, the OBiBT itself or the BT port on the OBi200. At any rate, Amazon, true to its word, rushed me replacements (along with a sincere "sorry you're having a problem") and I received them pronto.
I'm happy to report that after my initial testing, the Bluetooth features now appear to be working. Still a few more tests to go (like trying to pair a second phone even though the OBiBT can only support a single connection at a time). I will report final results later. In fact, I plan to post more detail about using OBiBT because it's so critical to my setup and there appears to be very little, if any, content on this forum about it.
The real hero of this story (to this point) is Amazon. OBihai could learn a thing or two about customer service from them.