The invoxia NVX 220 phone does not work without an Ethernet connection, so does not work with Wi-Fi.
We focus our work on the audio quality and Wifi tends to damage it.
Is it still possible to have the NVX 220 work with an Ethernet to Wifi Adapater (ex: Netgear Universal Wireless Internet Adapter WNCE2001) plugged to the LAN 
port and configured to your network.