Those are config instructions. I think what the OP is asking for is some kind of form where you could enter your ATA's MAC address and IP address and it will configure the ATA for you.
A couple of the providers I know who have this feature are 3Web and Ring Central.
The Voxilla web site used to have a tool like that for several providers, I am not sure if they still do.--
Providers (through asterisk): voip.ms, freephoneline, smartcall.ro. Hardware: Vonage VDV21, Moto VT2x42, Linksys SPA series, Grandstream HT series, Panasonic KX-TGP5x0