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.
I remain hopeful that MWI will return to GV. ;D
This should help you.
http://www.obitalk.com/forum/index.php?topic=8170.0
1. Select a different ring pattern for SP2.
Voice Services -> SP2 service -> X_DefaultRing: (2 thru 10)
Ring patterns are found here: Ring Settings -> Ring Profile A
Ring patterns can be modified.
2. Physical Interfaces -> Phone Port -> CallWaitingEnable: Checked
This is the default, so there may be something else wrong.
3. Voice Services -> SPx service -> MWIEnable: Checked
Like ceg3 indicated, I think GV doesn't support MWI.
In your GV account there is an option under Voicemail for email notification.