We have 2 SPA-112 units (running the latest 1.3.3(015) firmware) which are experiencing loss of registration on a regular basis. The web interface shows that the line is off-hook, and that it is registered. However, there is no dial tone on the line, and the SIP registrar (a Mitel 3300) shows that the line is out of service. The telltale sign of this problem is that the "Next Registration In:" field in the Voice tab is blank. Attached is the SIP debug log of an event - sometime during that window, the SPA lost registration.
