When Voice Client starts, and VPN is not connected and the variable vpn_configuration is either not set or set to 0, the Voice Client launches the app and routes everything through WiFi/Cellular network if the VPN is not connected.
The Voice Client always monitors the VPN status. If VPN is connected, Voice Client re-routes everything through the VPN network and If VPN was disconnected, Voice Client re-routes everything through the WiFi/Cellular network.