47 CFR § 69.157
Line port costs in excess of basic, analog service
February 16, 2021
To the extent that the costs of ISDN line ports, and line ports associated with other services, exceed the costs of a line port used for basic, analog service, local exchange carriers may recover the difference through a separate monthly end-user charge. As of June 30, 2000, these rates will be capped until June 30, 2005.
[65 FR 38704, June 21, 2000; 65 FR 57744, Sept. 26, 2000]