N.Y. Comp. Codes R. & Regs. tit. 16, § 602.10 – Directories.

(a) All service providers shall publish directories, or cause their numbers to be published. Directories shall be regularly published at approximately yearly intervals. The interval between directories shall not exceed 15 months without express commission approval. The form of directories shall ordinarily conform to the following criteria:
1. (1) A directory shall be in such form and list such information, as will permit the numbers of local exchange customers in the area covered by the directory to be obtained, except for public telephones and numbers unlisted at a customer's request.
2. (2) Information pertaining to emergency calls to such agencies as the police and fire departments shall appear conspicuously in the opening pages of the directory.
3. (3) Instructions concerning the placing of local and long distance calls, shall appear conspicuously in the opening pages of the directory. This section shall include access codes that can be used for placement of long distance calls, for those interexchange carriers agreeing to have their codes published. Directories will also include a telephone number for contacting each local service provider that serves the area covered by the directory at no additional cost to the service provider being listed.
4. (4) The introduction to the directory shall instruct customers to call the local service provider from which they receive service for information on billing, party lines, annoyance call procedures, emergency calling procedures and how to obtain tariff information.
(b) Each service provider shall distribute at no charge to its customers within a local exchange area, a copy of the local exchange directory for that area, and one additional copy shall be provided for each working telephone number upon request. A copy shall be filed with the commission.
(c) A service provider shall furnish its directory databases to all directory assistance service providers on terms and conditions no less favorable than the service provider furnishes such databases to its own or affiliated directory assistance service operations.
(d) In the event of an error in a number published in the directory, the service provider shall intercept calls to the published number for the life of the directory where such number is not already in service. Where the published number is in service, the party served by it shall be given appropriate transfer information, and also the opportunity for a number change (at no charge). In that event, the normal practice shall be to place the published number on intercept, for the life of the directory listing plus 30 days.
(e) Reasonable advance notice shall normally be given to the consumers affected when a service provider has cause to change a large group of numbers, even if such changes coincide with a directory issuance.