Have tried 2 differnent switches D-Link(DES-1105)AND LINKSYS (EG005W) and both failed when I tried to ping the lipu card over the internet. When I have the phone in the switch with the lipu I have no problem. The way I have this configured is internet coming in (static Public ip address) into ParaDyne (6350-a4-200) dsl modem. Then split using one of the 2 above switches between the lipu card and the network. Have worked with Toshiba tech support and all programing was in order but the tech would not recomend a switch to use all he said "get a dumb switch". I have done this once before using a Bipu a few years back testing at this location (our office) and had no problem before I went to the customer. Thanks for your input!!