Direct Inward System Access (Disa); Disa Security - Samsung DCS Manual

1.10 DIRECT INWARD SYSTEM ACCESS (DISA)

DISA allows the use of an incoming line to gain access to system resources for the purpose of dialling
an intercom, accessing a outside line, internal paging or changing external forward setting.
From outside of the office, selected individuals can call into the DCS system on special DISA line(s). A
security code must be entered to gain access. Once these individuals are in the system, they can:
• Make outside calls using the office lines
• Call stations within the system
OR
• Access paging resources
• Set/reset their external forward database.
Individuals who use DISA must have their stations assigned for DISA access and they must
change their station passcodes. The default passcode 1234 cannot be used. To use DISA:
• Call in on the DISA line from any phone with tone dialling.
• When you hear the DISA dial tone, dial your security code (the extension number plus your station
passcode).
• If you are allowed access, you will receive system dial tone.
• Dial any line access code, receive outside dial tone and then dial a telephone number
- OR - dial any extension number to call a station in the system.
• To make a second intercom call press ¦R, receive dial tone and dial another extension number.
• Press # and hang up when finished.
NOTE: Outgoing DISA calls are controlled by the dialling class of the station identified by the
security code. The DISA line must have disconnect supervision from the central office. Insist that this
condition be verified by your service company.

1.11 DISA SECURITY

A common practice among hackers is to repeatedly dial a known DISA access number (usually with a
computer) and try a different passcode each time. The hacker hopes to eventually chance upon the
correct passcode and thus gain access to your system. The SAMSUNG DCS' security
feature will count the number of sequential incorrect passcode attempts, and if a certain number is
reached, DISA will be disabled and the system will alert designated stations. The number of incorrect
passcodes and the disable duration are both programmable. In addition, the DCS system will print an
SMDR record (a customer-provided printer and a SIM are required) each time an incorrect passcode is
entered.
To clear the DISA alarm, follow the following procedure:
• Lift the handset and dial the access code 58.
• Enter the DISA alarm passcode (see your Samsung Communication Specialist for this number).
• Replace the handset.
Warning
As it is impossible to prevent unauthorised access to your telephone system by hackers, we
suggest that you do not turn the DISA feature on unless you intend to use it. If you do use this
feature, it is good practice to frequently change access passcodes and periodically review your
telephone records for unauthorised use.
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