The Local Calling Area Database (LCAD) can be used to quickly identify the jurisdictional relationship between any originating NPA NXX and terminating NPA NXX call combination. These relationships include determining whether the call is local, intraLATA, interLATA, intrastate, interstate, and for wireless to wireless or wireless to landline, whether the call is intraMTA or interMTA.
Compiled from current carrier sources, the NALENND® LCAD contains local calling area information to identify the basic and expanded local calling areas for telephone exchanges in the United States and Canada based on incumbent wireline carriers' calling area definitions. They can be used as an aid in calling plan design, traffic and least cost routing, or similar application that needs to distinguish between local and toll calls.