i have a problems with wip310 (latest firmware) and SPA9000 (latest firmware) and 4 SPA941 (latest firmware)
the wip310 are connect wi-fi via Apple Airport Extreme Base Station to SPA9000
if i call an internal SPA941 the phone ring but if i answer no sound pass but if i hangup and recall the sound are ok
i test reset wip310 and reconfigure, change Apple Airport Extreme Base Station and reconfigure, but the problems are the same.
i attach wip310 config
wip310 are not in the same subnet are connect to SPA9000 via VPN (i have 2 SPA941 in the same subnet oh wip310 work ok) i configure first wip310 in the same subnet of spa9000 them i connect wip310 in other subnet.