It looks like vestalink is bypassing obitalk's web page, which seems like a good explanation for why obi does not mention them anymore. In order to get vestalink to work, they want you to reset to factory default which disconnects the obi device from obitalk site's configuration and they do not say anything about using the obitalk after that. Vestalink requiring a reset to factory default implies they know how to "hack" the old obi software, but not the new software. If you want to use google voice now with an obi100 device (i can't get vestalink to work anymore as of last week), you have to pay obi $10 for "support". It requires installing the new firmware, which I guess is necessary to work with Google voice, if not meant to block vestalink and others. I can't see that paying the $10 does anything other than letting you get past their web page blocks to connect to google, which I guess is how they post-finance the creation of the new firmware.
Update: I wouldn't have thought it was possible but it seems like the new firmware does not allow resetting to default. Vestalink's online software, nor following their hard reset instructions are enabling me to erase the firmware. And here's where my problem might be "If your OBi ATA is linked to the OBiTalk portal, any local LAN settings, including a factory reset, my be over-ridden or reversed by the OBiTalk connected portal. "