D.C. Code § 34-221: “Telephone line” defined.

The term “telephone line” when used in this subtitle includes conduits, ducts, poles, wires, cables, crossarms, receivers, transmitters, instruments, machines, and appliances, and all devices, real estate, franchises, easements, apparatus, fixtures, property, appurtenances, and routes used, operated, controlled, or owned by any telephone corporation to facilitate the business of affording telephonic communication for hire, or which licenses, lets, or permits telephonic communication.