I have an asterisk box that I connect my HT-502 to on a LAN, so there is not likely to be any connectivity or latency problems. Yesterday I found the 502 to all of a sudden NOT be registered to my * box anymore. I rebooted it and it re-registered and started working again. Sounds very similar to the problems VOIPo was having with them. It was connected for a couple of days and then suddenly disappeared. It is running the .21 firmware so I am thinking about backing it down to an older version.