My home number was ported to GV a couple years back and I have been using OBI ever since.
Many months ago I was playing with apps such as GrooveIP on my smartphone, to use my other GV number on my cell - but the quality just wasn't working well - so I stopped messing with it for nearly a year. I recently started tinkering with it; and I've had pretty good success at using the APP to make GV calls from my smarthphone, and thereby not use my AT&T minutes.
However; when I use the GV APP on my cell to call my home number, which is a GV on OBI; it immediately goes to a voice mail. What's even weirder; if I call my house using my normal cell provider AT&T, or my work phone I call my house, a different answering machine picks up.
My standard answering machine messages greets people with a company name (wife's home business), but when I call with my GV app on my smart phone, it greets people with a "thanks for calling Joe, please leave a message" - and the home phone doesn't ring and in call history on OBI there was no incoming call showing.
It feels like it might be a GV setting on either my house GV or cell GV - but not getting it. It doesn't seem to be the OBI Attendant either, because it's my voice answering.