47 CFR §51.335

1. (a)If an incumbent LEC claims that information otherwise required to be disclosed is confidential or proprietary, the incumbent LEC's public notice must include, in addition to the information identified in § 51.327(a), a statement that the incumbent LEC will make further information available to those signing a nondisclosure agreement.
2. (b)Tolling the public notice period. Upon receipt by an incumbent LEC of a competing service provider's request for disclosure of confidential or proprietary information, the applicable public notice period will be tolled until the parties agree on the terms of a nondisclosure agreement. An incumbent LEC receiving such a request must amend its public notice as follows:
   1. (1)On the date it receives a request from a competing service provider for disclosure of confidential or proprietary information, to state that the notice period is tolled; and
   2. (2)On the date the nondisclosure agreement is finalized, to specify a new implementation date.