(b) For purposes of § 64.2309, a telecommunications carrier provides subscriber list information on an unbundled basis only if the carrier provides:

1. (1) The listings the directory publisher requests and no other listings, products, or services; or
2. (2) Subscriber list information on a basis determined in accordance with paragraph (c) of this section.

(c) If the carrier's internal systems do not permit it unbundle subscriber list information on the basis a directory publisher requests, the carrier must:

1. (1) Within thirty days of receiving the publisher's request, inform the directory publisher that it cannot unbundle subscriber list information on the requested basis and tell the directory publisher the bases on which the carrier can unbundle subscriber list information; and
2. (2) In accordance with paragraph (d) of this section, provide subscriber list information to the directory publisher unbundled on the basis the directory publisher chooses from among the available bases.