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3.3 Customising Your PBX (System Programming)
142 User Manual
DISA Security Code Digits [530]
You can select the number of digits used for DISA security codes assigned in DISA Security Code [512].
• WARNING
There is a risk that fraudulent telephone calls will be made using the Outside-to-
Outside (CO-to-CO) Line Call feature of DISA.
The cost of such calls will be billed to the owner/renter of the PBX.
To protect the PBX from this kind of fraudulent use, we strongly recommend:
a) Enabling DISA security (Trunk Security or All Security).
b) Keeping DISA security codes secret.
c) Selecting complex, random codes that cannot be easily guessed.
d) Changing codes regularly.
• Security code numbers (not security codes) are logged by Station Message Detail
Recording (SMDR).
• The number of digits required for DISA security codes can be assigned in DISA Security
Code Digits [530].
• When this setting is changed, all assigned DISA security codes are cleared.
Press NEXT.Enter 530.
5 3 0
NEXT
Press SELECT
(4–10 digits).
SELECT
To end
Press STORE.
STORE
Press END.
END