4-11
Data Security
Single line telephones used with modems and facsimile machines can be programmed so
that they will not receive any system-generated tones that would disrupt data transmissions.
In addition, these devices receive DCS C.O. ringing pattern instead of internal ring pattern.
Devices connected to an SLI card receive a disconnect signal upon termination.
DECT Service
DECT cordless communications can be implemented with the addition of one or more Base
Station Interface (8BSI) cards, DECT Base Stations (DBS) and DECT handsets. The service
allows users to be contacted or to make calls while away from their desks.
Direct In Lines
Outside lines may be programmed to bypass the operator(s) and ring directly at any station
or group of stations.
Direct Dialling In (DDI)
Direct Dialling In (DDI) refers to digit steered inbound call handling. This service is provided
over ISDN PRI and BRI circuits.
Direct Inward System Access (DISA)
Users can call in on specific DISA lines at any time, input a security code and receive system
dial tone. Users can then place internal calls or, if permitted, calls using C.O. lines. The caller
must have a tone dial phone and know his/her DISA security code. DISA lines can be used
as ‘both way’ lines or incoming only and may be active/inactive according to the ring plan
table. The C.O. lines used for DISA must have disconnect supervision. The requirement to
put in a DISA security code can be disabled if desired.
Direct Trunk Selection
Each station can be allowed access to or denied access from a trunk or trunk group by
access code when LCR is activated. When restricted, the station user must use a trunk key
or a route key.
Directory Names
Each station, station group and C.O. line may be assigned a directory name (maximum 11
characters). In addition, each personal speed dial number, system speed dial number and
entry in the DDI translation table may be assigned a name (maximum 11 characters). These
names are displayed during calls with these ports and in the case of station and speed dial
names, can be used to originate calls. See the
feature in
Display Features
.
DISA Security
Telephone fraud and long-distance theft are a serious concern. The system provides a strong
DISA security system. If an incorrect DISA passcode is entered repeatedly (as is the case
with “hackers”), the DISA system can be automatically disabled temporarily. Both the allowed
number of incorrect passcode attempts and the time for which DISA is disabled are
programmable. In addition, all failed attempts to access DISA will print on SMDR (if provided)
with a “DE” DISA error flag.
