The page I get is what you found on netfaq. I have called SBC and it appears that they changed the Siemens (usefull inteface) to their own (useless interface).
As I expected from the LAN IP adresses. In which case you do not have control over the router, no port forwarding or DMZ settings available (ie NAT capabilities). There are hacks to overcome this but if discovered by your ISP would likely result in discontinuation of service.
Moreover, they cannot change my IP address to static based on my account type, whatever that means.
That means you have not paid for a business account, usually the account type which ISPs will provide a static public IP address. But you are confusing LAN (private) and WAN (public) static IP addresses. You can configure a static LAN IP as you described but it will achieve nothing unless you have control over the router.
I already followed the instructions static IP page, it does nothing.
As mentioned above, yes, this will achieve nothing unless you can control the router.
Only two ideas remain. There is an option to setup the modem for remote access, if that might help.
Or maybe somesort of second party port forwarding software.
LOL, by the time this is sorted out the Klingon Civil War will be over.
It might be worth my taking a look at the remote access but I think we have been through all the options and it would be difficult to schedule.
There is no "second party port forwarding software" to do such a job, an equivalent option is to hack the firmware of your modem/router and replace it, usually over tFTP, but I do not recomend this, as it is not really legal.
At this point I reccomend that you change ISPs. Cable is far superior to ADSL in many respects. If you do, tell your old ISP why you left them and maybe someday they will change their silly ways and provide future customers real service, saving them pains like this.
edit: alternatively, you could purchase your own fully functional Speedstream 4100/5200 to connect to their network, which may or may not work.