As per the subject, I'm wondering if the FitzBox adds a 802.1p tag to the voip traffic? I've had a look through the pages on the FitzBox and can't see any settings to suggest it does. I haven't looked at any config files, however, as my router for some reason came unprovisioned, and the only setup I am aware of was done through the web interface, I suspect that there's nothing in there either.