Obihai might decide to block the manual download in the future (so you might want to download the file now).
There are a couple of points to consider before installing the official firmware:
1. In the event you have problems with 3.2.2. (Build: 5859EX), you can't downgrade to a lower firmware version.
2. You can't apply the hacked firmware version of 3.2.2. (Build: 5859EX) that allows you to provision Google Voice without using Obitalk.com.
I'm not providing support for the hacked firmware version (use it at your own risk). Questions about it can asked at http://www.dslreports.com/forum/r317927 ... mware-mods.
Obviously, once Google Voice drops XMPP support after June 18th, you're going to need to make a decision. If you don't update firmware (either the official or hacked version), Google Voice is going to stop working for you.