I've managed to get it working. What I've done:
1. I have my 347-450-XXXX (business, SP1) number go to OBI110 and iPhone.
2. I have my 609-741-XXXX (personal, SP2) number go to just my OBI110.
I've set up call forwarding on my iPhone, using 'Forward Busy and No Answer (*28)' (
see explanations here)
When someone calls my personal 609-224-XXXX number it first rings my iPhone, and if I decline, it gets forwarded to my 609-741-XXXX number, which then will ring my OBI110. This way if I'm out and I have service, I can accept the call, or if I'm at home with no service, I can decline it, and it'll ring my OBI110.
Thanks again for a great product.
-Dustin