Technical information

Security Measures
Issue 7 June 2001
4-47
Disable Distinctive Audible Alert
Distinctive Audible Alert on a 2500 set has the potential of returning stutter dial
tone when used in conjunction with Voice Response Units — modems, FAX
machines, voice mail ports, and CONVERSANT Voice Information System ports.
The stutter dial tone, in turn, converts to steady dial tone and allows a call to be
made.
Analog ports assigned to adjunct equipment should have the Distinctive Audible
Alert feature (a field on the 2500 screen) set to
no; The default is yes; thus, it
should be changed to
no.
For System 75, DEFINITY ECS, and DEFINITY G1, and G3, use change station
to display the station form. Enter
n in the distinctive audible alert field.
Remove Data Origination Code
The Data Origination feature is used in conjunction with modem pooling. It allows
users to bypass many system restrictions and gives them access to outside
facilities. It has the potential to be used by hackers to compromise a system.
The Data Origination default code is 134. When a voice mail system is set to digits
(instead of subscriber), the COR restrictions on the voice ports are not valid when
the Data Origination code is used. If a voice mail system is set to digits and 134 is
dialed from any phone, the switch returns outside dial tone and allows a call to be
processed.
It is recommended that the Data Origination code be removed. If this feature is
used, then the code should be changed.
Use World Class Routing Restrictions
(DEFINITY G2.2 and G3 only)
For DEFINITY ECS and DEFINITY G2.2 and G3, use the following steps to
restrict WCR from unauthorized use.
For DEFINITY ECS and DEFINITY G3:
 Miscellaneous Restrictions (COR-to-COR restrictions) are not observed
during AAR/ARS call processing. The FRL value is used instead.
 Use change COR to display the Class of Restriction screen.
 Assign the lowest possible FRL to the barrier code, authorization code,
VDN, station, or inbound trunk group. Use
change trunk-group to assign
the COR to all incoming trunks.
 Use tandem tie trunks for routing private network calls.
 Use change toll to display the Toll screen. Identify what calls are allowed
or disallowed.