Section 49-21-01.6 - Call identification services - Charges prohibited - Notice - Exceptions1. Any telephone call identification service offered in this state by a telecommunications company must allow a caller on a per-call and a per-line basis to withhold display of a caller's telephone number from the telephone instrument of the individual receiving the telephone call placed by the caller.2. A telecommunications company offering call identification services may not charge any person who requests that the call identification services be blocked on a per-call basis. Per-line blocking must be provided without charge for residential customers and business customers with special needs, such as law enforcement and domestic violence agencies.3. A telecommunications company offering a call identification service shall notify its subscribers that their calls may be identified to a called party at least thirty days before the service is offered.4. This section does not apply to: a. An identification service that is used within the same limited system, including a Centrex, Centron, or private branch exchange (PBX) system, as the recipient telephone.b. An identification service that is used on a public agency's emergency telephone line or on a line that receives the primary emergency telephone number (911).c. An identification service provided in connection with legally sanctioned call tracing or tapping procedures.d. An identification service provided in connection with any "700", "800", or "900" access code telecommunications service, or any voice or data store and forward service.e. Any other service that, after investigation by the commission, the commission finds that a nondisclosure or similar agreement will protect the privacy interests of a calling party.