AT&T Corp. v. Iowa Utilities Board
In AT&T Corp. v. Iowa Utilities Board, 525 U.S. 366 (1999), the Court reinstated 47 C.F.R. 51.315(b) because, without that section of the rule, "incumbents could impose wasteful costs on even those carriers who requested less than the whole network.
It is well within the bounds of the reasonable for the Commission to opt in favor of ensuring against an anticompetitive practice." 525 U.S. at 395.
The Court did not address the validity of the remainder of 47 C.F.R. 51.315, namely whether 51.315(c) was within the bounds of the Act.