The last I heard, 4738 was the latest firmware for the 200 and 202 ATAs. I am sticking with 4581 for now, based on several reports of some things not working correctly (for instance, SP4 configurations breaking) on the 4738 firmware. But this begs the question: What if I want to add a GV account to my device or change a GV password today? I need to be on 4738 to do so, right?
So, what's the resolution: Upgrade, change GV, downgrade? Unfortunately, the ins-and-outs of configuring these OBis have become anything but simple since OBiHAI started changing the rules of the game, and what's to prevent them from issuing a future firmware update which prevents downgrading? I really like the self-contained nature of GV under these OBis, but Ryan Tilton's OAUTH2.0 under Asterisk is looking more-and-more desirable as things progress.