APPLICABILITY.

(a) This subchapter applies only to the provision of caller identification service. (b) This subchapter does not apply to: (1) an identification service that is used in a limited system, including a central office based PBX-type system; (2) information that is used on a public agency's emergency telephone line or on a line that receives the primary emergency telephone number (911); (3) information exchanged between telecommunications utilities, enhanced service providers, or other entities that is necessary for the setting up, processing, transmission, or billing of telecommunications or related services; (4) information provided in compliance with applicable law or legal process; or (5) an identification service provided in connection with a 700, 800, or 900 access code telecommunications service.