Technical information

Automated Attendant

7-16 Issue 7 June 2001

Protecting Automated Attendant on the

AUDIX Voice Mail System

This section discusses security measures implemented directly on the AUDIX

Voice Mail System automated attendant.

Disallow Outside Calls

The AUDIX Voice Mail System integrated with DEFINITY ECS, DEFINITY G1,

G2, and G3, System 85 R2V4, and System 75 R1V3 (Issue 2.0) and later, provide

a feature called Enhanced Call Transfer that only transfers AUDIX Voice Mail

System calls to valid PBX extension numbers. With Enhanced Call Transfer, when

an automated attendant caller enters an extension as a menu choice, the AUDIX

Voice Mail System checks the digits to see if they match the extension length

before sending the digits to the switch.

CAUTION:

If Trunk Access Code (TAC) calls are permitted, they may be accepted as a

valid extension number. Even with Enhanced Call Transfer activated, toll

hackers can choose a menu option that allows an extension number, and

then enter a TAC to get an outside line.

Another advantage of this feature is that when a toll hacker tries to enter an

unauthorized number, the AUDIX Voice Mail System error message notifies the

hacker that this automated attendant system is secure.

For DEFINITY ECS and DEFINITY G1 and G3:

1. On the AUDIX Voice Mail System system:appearance form, enter

y in the

Call Transfer Out of AUDIX field.

2. Enter y in the Enhanced Call Transfer field.

3. Press Change/Run.

4. On the AUDIX Voice Mail System maintenance:audits:fp form, tab to the

Service Dispatcher field and enter

5. Tab to the Start field and enter

6. Press Change/Run.

7. On the switch, use

change listed-directory-numbers to add a valid

extension for your attendant.