Has anyone set up a commercial IPcentrex service yet utilising the latest SIP phones which support IAX? It seems to me that IAX is the best way forward given the problems with NAT (and the shortage of bandwidth with BT's ADSL services here in the UK) and that the latest phones (Verbiage) would seem to be cheap enough. The main complexity i guess would be the dial plan to support a diverse group of end-users with Asterix in a data center, and the need for a simple user interface so subscribers can self-configure. Brian