For anyone wondering, it appears that I had to enable MWIEnable, MWIEnable2, X_VMWIEnable and X_VMWIEnable2 for the indicator to work. After doing my own research, it does not appear that VOIPo currently supports X_MWISubscribe nor X_MWISubscribeURI. When I had those set the Obi202 was getting errors back saying the SUBSCRIBE was not supported.

I have found that the MWI indicator is a little flakey in that it sometimes takes a minute or two for the indicator to show up. And then also on the backside, it seems to take a while to go off after I retrieve my messages.

Hope this helps someone out there!