There was an H323 bug in the FVS318. Netgear put out a new firmware patch for it, but it did not fix it for me. It allowed the phones to register, but they would reboot intermittently, some times in the middle of a call. So I ended up swapping those out. The FVS114 and the FVS338 have worked great, but I avoid the FVS318 at all costs. Just an FYI to everyone to hopefully save some headache, because customers seem to get their hands on the FVS318 constantly, and we have to tell them to return it.