I think this might be it: https://www.ecfr.gov/current/title-47/chapter-I/subchapter-B/part-51/subpart-G/section-51.605 https://www.ecfr.gov/current/title-47/ch

I think this might be it: https://www.ecfr.gov/current/title-47/chapter-I/subchapter-B/part-51/subpart-G/section-51.605 https://www.ecfr.gov/current/title-47/chapter-I/subchapter-B... I'm not sure if the large networks are called Local Exchange Carriers (LECs), but if they aren't I presume there are similar resale requirements for them anyway.