If the SIP stack fails to REGISTER even once, it will never try to reestablish connectivity, even though the WLAN stack and IP stack has reconnected.
Unplug network from router when REGISTER expiration is due, and before E60 has reregistered. Reconnect network to router, and all other wireless SIP clients will re-REGISTER, but NOT the E60.
If registration is set to "always on", then rebooting the phone will resolve the problem.
If registreation i set to "when needed" I have to place a call for the phone to re-REGISTER.
Is there som setting where I can persuade the phone to try to restablish