In the HH2B Siemens were kind enough to give us a hidden setup page where the connection settings can be changed to suit your ISP.
This is handy for those outside the UK and those using LLU services in the UK.
Since it's discovery by Iota this page has moved location from firmware update to firmware update, however I have found the universal link to it that works for all versions.

To access the page simply put the link below into the address bar:

http://192.168.1.254/thd_setup

And after putting in your password... Viola!

Psi