Specifications

CONTENTS
4–1.10
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 now 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 in day mode, night mode or both. The C.O. lines used for DISA must have
disconnect supervision.
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 (maxi-
mum 11 characters). In addition, each personal speed dial number, system speed
dial number and entry in the DID translation table may be assigned a name (maxi-
mum 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
Dial by Name feature (Station Features).
DISA SECURITY
Telephone fraud and long distance theft continue to increase; therefore, we have
introduced a DISA security system. If an incorrect DISA passcode is entered re-
peatedly (as is the case with “hackers”), the DISA system can be automatically
disabled temporarily. Both the number of incorrect passcode attempts and the time
that DISA is disabled are programmable. In addition, all failed attempts to access
DISA print on SMDR (if provided) with a “DE” DISA error flag.
DISTINCTIVE RINGING
A user knows the type of call received by the type of ring heard. Outside calls have
a single ring repeated while internal calls have a double ring repeated.
DOOR LOCK RELEASE (PROGRAMMABLE)
After answering a call from the door phone, users can dial a code to activate a contact
closure. This can be used to operate a customer-provided electric door lock release
mechanism. The contact closure timer is programmable from 100–2500 ms.
DOOR PHONES
The door phone interface module (DPIM) provides for connection of a door phone
to a DLI port. Pressing the button on the door phone produces a distinctive ring
(three short rings repeated) at the assigned station or station group. If not an-
swered within a programmable time, the system releases the door phone and stops
the ringing. Stations may call the door phone directly and monitor the surrounding
areas.