This forum is awesome. I started this adventure not knowing anything about how any of this works, and a few short days later, have ported my land line away from cable VoIP to GoogleVoice, set up a CallCentric account for 911 and got a DirtCheapDID for incoming CallerID name (a week of no name after years of being used to them showed me that $2.95/month for that service is worth it), got all that set up on the Obi110 through the wiring in my house.
You guys made it WAY easier than it would have been, but I have to admit, this Obi110 device is relatively easy to set up all things considered. The initial set up (before I had CallCentric) was about as easy as anything I've installed.
So, thanks to your help, I am a tad better versed in these matters, have a $4.45/month phone bill, and won't end up in a roadside ditch for having cable.
Jeff.