Mptribe,
Did you ever get a solution for this? I just signed up with Phone Power today and am having the same issue. I have a Google Voice phone number that I am forwarding to PP, and I set it up so the PP voicemail system picks up before GV. That all works fine, but no voicemail indicator is coming up on my local phone, despite this being enabled through OBiTALK. I'd love to get this solved!