Lots and lots of discussion, and misunderstanding, on that topic on here.
In summary, it is not a bug. The Obi is behaving the same way as 'Google Chat' is, or will function, if you receive the same call in Google Chat inside Gmail in a browser. That is to say the call will ring but you will not get the
usual GV call screening, press 1 to accept, 2 to send to voice mail, (one of several such explanations
here). Disconnect your Obi, check forward to Google Chat, open a browser, receive a and see for yourself.
The important point is the call screening prompts you hear are different when the call is answered from a 'forwarding phone' and from 'Google Chat' from within a browser. Calls answered on forwarding phones have the full call screening, Audio Caller It and Listen In, if you have call groups set up appropriately. In a point that is almost completely misunderstood by first time users, you actually have the full call screening, (and Audio Caller It and Listen In) when answered via an Obi, you just do not know it because you do not get the GV female voice prompts "Call from X, press one to ....", instead you hear 'dear air', you have to know to press 1 or 2.
You have three basic choices here, two of which involve the X_SkipCallScreening field on a pure GV setup:
1. You receive a call and the X_SkipCallScreening field is enabled, the call is immediately connected when answered because the Obi sent the 1, silently and in the background for you.
2. You receive a call and the X_SkipCallScreening field is not enabled. As soon as you pickup the call you hear nothing ('dead air'), the caller continues to hear the phone ringing (his or her 'ring back pattern'), and both of these things continue until you press 1 (to connect the call) or 2 (to sent to voicemail) or 25 seconds elapses. If you do not do nothing within 25 seconds, the call goes to your GV VM.
3. You use a second SP slot in your Obi, and forward your GV calls to the phone number for that 'SIP provider', configure incoming GV calls to not ring your GV Obi number. That means: No incoming calls ring GV in your Obi, all outgoing calls go out via GV, the incoming calls GV forwards to the SIP provider number are treated as a forwarding phone, and therefore you answer using the full call screening with fill voice prompts.
#3 is a very popular way to do it on here, people use providers such as CallCentric, Anveo,voip.ms.
The CallCentric setup is the most popular, mostly because it's free and for calls from the US you get free Caller Name (CNAM). If you pay $1.50 per month you get e911 via CC. Full explained in linked thread.
To review, 1 and 2 above are analogous to how an incoming call in 'Google Chat' behaves where you must click on one of two buttons, Answer or Voicemail. #3 works exactly how any other forwarding phone in you GV (mobile, landline, etc) settings works, i.e., full voice prompts as explained in the linked GV help page.
