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carrier access code (CAC)

A code (dialed by the user) to select a specific service provided by the entity to which the code is assigned by the NANPA (North American Numbering Plan Administration); the code used is either 10xxx or 101xxxX where the Xs represent the 3- or 4-digit code that was assigned. The originating switch uses the code to route the call to a specific trunk group.


Glossary