I initially had many problems with the WIP310 and Pennytel (an Australian TISP). Registrations would fail and the Wireless connection to various brands of home routers would fail. At the moment the phone is stable.
Firmware -> 5.012(12141857) beta
Wifi -> WPA only
Encryption -> TKIP
I believe most of my problems were associated with WPA2 and AES encryption.
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