FWIW, my 202 is registered with OBiTalk, but with all auto-provisioning disabled (but with OBiTalk voice service still enabled), and I don't recall ever seeing its uptime change autonomously. It only resets if I reboot it. If you don't disable auto-provisioning, the OBiTalk portal will occasionally push changes to your box, and most of them require a reboot to take effect, resetting the uptime stats.