I don't think VLAN is supported in Bridge mode on this model router. Bridge mode is only for wireless bridging with the router and connecting wired clients to the 880L when in bridge mode. If you changed to bridge mode, then the router is probably not bricked, rather you need to find the new IP address assigned to it, maybe 192.168.0.50 or just do a factory reset. If you only have one VoIP device connected to the router, then do a IP reservation for this device, them put it into the routers DMZ. This is in main host router mode, not bridged. I have my microcell place in my DMZ. Works just fine. I don't think VLAN is needed for VoIP in this configuration maybe.