Ameritech New Media is a subsidiary of Ameritech. Ameritech was one of the original seven RBOCs, though they're now owned by SBC.
So, what you're saying is, there is some area where a RBOC subsidiary is competing against another RBOC, and they each laid their own independent wire to consumers' houses?
I've Googled them, and I can find much about their cable TV service in Chicago. I can't find any references to their telephony services - perhaps you can point me to some references?