i guess maybe another company does wisconsin's state relay but i know mci has a center in madison, wi that handles ip-relay calls. there's also an mci center in the phillipines but i don't think they do ip-relay they may just do relay inside of the phillipines.
my friend who work for mci explained this to me. mci has 4 state contracts CA, AZ, WI, and TN. the other 4 centers are directory servce the indian company bought those too