As 5/15 is approaching, I finally decided to use Anveo on my Obihai. I followed Obihai portal and paid $39 to Anveo (which was the only perfectly working part~~) then forwarded my GV to Anveo number. Outgoing calls seem fine. As for incoming calls, many of my friends could not reach my GV number any more. They just got into GV voicemail directly (my home phone did not ring at all). If you directly call Anveo number, it goes through. But if you call GV# which forwards to Anveo number, you get problem. So the problem is GV --> Anveo.
Then I tried to port my GV number to Anveo. On Anveo porting portal, everything was fine till "Call Verification" where Anveo were supposed to give me a call to verify my GV number. That call never happened. (see UPDATE below)
The so called "Customer service" of Anveo is only a answering machine - it asked me to submit a online tickect. I did. Now two days passed, nothing happened.
**UPDATE:**
I found the voice mail from Anveo in google voice "Spam" folder.
I have successfully ported my GV# to Anveo. Keep watching how it goes...