* National Do Not Call (DNC) Registry. With 240-million numbers, this is updated every week. . The National Do Not Call Registry is a database maintained by the United States federal government, listing the telephone numbers of individuals and families who have requested that telemarketers not contact them without prior written consent. Many callers are required by federal law to respect this request. Separate laws and regulations apply to robocalls in the United States.
* Do-Not-Originate (DNO) list is required by both FCC and FTC rules to assure that your network is not carrying calls with false or unauthorized ANIs. This list contains 1.03 billion numbers, and is updated monthly.
* Location Routing Number (LRN/LNP) tracks every ported number in the U.S. and Canada, with about 1-billion numbers. It is updated every day, and is essential to the operation of network services.
* Local Exchange Routing Guide (LERG) is a database of telecommunications numbering resources for use in the administration and operation of the North American Numbering Plan (NANP) and is used by telecommunications service providers to provide essential services.