Update... If I change the Anveo registration from SP4 to SP3, it works fine. So, I figured there was some screwed up configuration somewhere, maybe something I did, maybe not. So, I logged into the device UI and reset the configuration. Deleted the device from OBiTALK's site and re-added it.
Nope, still can't add Anveo on SP4. But it works on SP3.
I've had Anveo running on SP4 for quite some time and now all of a sudden it stopped working.