Wildix W04FXS is a wall-mounted Media Gateway that connects traditional analog phones and fax machines to a VoIP network. It has four FXS ports for connecting analog devices and one WAN/PoE port for connecting to a network. The device can be used in two network modes: Route and Bridge modes. In Route mode, the device acts as a router and can be assigned an IP address by a DHCP server. In Bridge mode, the device acts as a bridge and does not need to be assigned an IP address.

The W04FXS supports differentiated ringtones for internal/ external/ blacklist/ whitelist call classes. This allows you to easily identify the type of call that is coming in. The device also supports call control using the Flash button. This allows you to perform various call control functions, such as transferring calls, putting calls on hold, and retrieving calls from voicemail.