You can administer incoming trunk groups within a system to always require an authorization code. The system applies recall dial tone to a call when the user must dial an authorization code. If the user dials a correct authorization code within 10 seconds (interdigit timeout), the system completes the call as dialed. If the user does not dial an authorization code, or dials an incorrect authorization code, the system routes to the call to an attendant. The system can also route the call to an intercept tone based on how the system was administered.

Usually, Direct Inward Dialing (DID) trunks do not require authorization codes. However, you can administer DID trunks to require an authorization code, but you must do this carefully. Different types of calls can terminate at different endpoints, and requiring an authorization code can be confuse the user.

You can also administer a Cancellation of Authorization Code Request (CACR) digit. The CACR digit cancels the 10-second interval between dialing. When the user dials the CACR digit, the system immediately routes the call according to system administration. Incoming trunk calls receive intercept tone or go to the attendant. Other calls receive intercept tone unless the user’s FRL is high enough to route the call. A CACR digit from an off-premises extension over DID and Tie trunks use DID and Tie trunk intercept treatment. Internal calls receive intercept tone.

You must not program passwords or authorization codes onto auto dial buttons. Because display telephones display the programmed buttons, the potential exists for an unauthorized person to use the autodial buttons. If you must program passwords or authorization codes onto auto dial buttons, use the ~s (suppress) character to prevent displaying the codes.