Thanks, I read that thread but I'm confused about oleg's method. The IP address list or the port number are clear.
On Freephoneline you get a phone number for the area code where you live (or where you want) so it will look like any regular phone number for your area including area code. You can even port your current POTS number if you want. The account number (ID) is 1+your phone number. Reading the other thread I see reference to some specific fix digits which is not the case here as a freephoneline can be any phone number.
Maybe OBI can add the "range" feature on a revision of the firmware ?