When you dial an authorization code, the Facilities Restriction Level (FRL) that is assigned to the extension, the attendant console, the incoming trunk group, or the remote access trunk group that is in use for the call is replaced by the FRL assigned to the authorization code. The FRL that is assigned to the authorization code functions in the same way as the original FRL. However, the new FRL that is assigned to the authorization code might represent greater or lesser calling privileges than the original FRL. Access to any given facility depends on the restrictions associated with the FRL of the authorization code.

The following example shows how authorization codes work with FRLs.

A supervisor is at a desk of an employee. Some employees might have telephone extensions that might not have an FRL assigned to the employees. However, a supervisor can make a call using any telephone if the supervisor has the authorization code assigned to the FRL.