Requests for Information Under the Electronic Communications Privacy Act
The Federal Bureau of Investigation may issue a national security letter to request, and a provider may disclose, only the four types of information—name, address, length of service, and local and long distance toll billing records—listed in 18 U.S.C. § 2709(b)(1).
The term “local and long distance toll billing records” in section 2709(b)(1) extends to records that could be used to assess a charge for outgoing or incoming calls, whether or not the records are used for that purpose, and whether they are linked to a particular account or kept in aggregate form.
Before issuance of a national security letter, a provider may not tell the FBI whether that provider serves a particular customer or telephone number, unless the FBI is asking only whether the number is assigned, or belongs, to that provider.