Some standard features seem to be missing in this Obi/Google Voice implementation.
1. I have two different google voice numbers set up as SP1 and SP2 in the Obi. But when a call comes in, it is impossible to figure out which Google Voice number is being called. A distinctive ring would be nice if possible.
2. When I am on a call and another comes in, I don't get a call waiting indicator so I can flash and add it to the call or at least answer it.
3. There doesn't seem to be a voicemail indicator, which commonly is given by a flashing light on the telephone apparatus as well as a stutter dial tone.
If I have missed out on how to implement these please let me know.