ATT System 25 Reference Manual

Dial Access to Message Waiting Indicators
Dial Access to Message Waiting Indicators
Description
This feature allows users to turn on or turn off the message waiting indicator on any voice
terminal in the system by dialing a code.
To turn on a Message LED at some station, the user first goes off-hook, or flashes the
switchhook, to get dial tone.The user then dials activation code #90 followed by the
extension number of the target station. If the attempt to turn on the LED is allowed, the
caller receives...

FEATURES AND SERVICES
Dial Plan
The dialing plan for System 25 is based on the concept that, whenever possible, calls should
be placed to individuals rather than to voice terminals. To implement this concept,
individuals are assigned Personal Dial Codes (PDCs) and are allowed to sign in those PDCs
at other voice terminals. There are two types of PDCs: assigned and floating. An assigned
PDC is associated with each voice terminal. Floating PDCs (FPDCs) may be signed in at any
voice terminal. Calls to FPDCs...

Dial Plan
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
lV — PAUSE character (in programmed numbers)
#100-#189 — System Speed Dialing Codes
#190-#199 — Virtual Facility Codes
#20-#39 — Personal Speed Dialing Codes
#4 — Activate Program mode
#5 — Insert dialed digits here (in Virtual Facility numbers)
#8 — Start end-to-end signaling (in programmed numbers)
#60 — Activate Callback Queuing at single-line voice terminal
#61 — Cancel Callback Queuing request at single-line voice terminal
#70 — Activate Forwarding
#90 —...

FEATURES AND SERVICES
Data Dial Codes (DDCs)
At the time of installation each digital data endpoint will be assigned a Data Dial Code (DDC)
that serves as its extension number. A maximum of 104 DDCs may be allocated in a system.
Direct Inward Dial (DID) Number Assignments
Each DID number is associated with a unique PDC (floating or assigned), a DGC access
code, a Remote Access point, a DDC, or a pooled facility access code. The code associated
with a DID number is the last 2, 3, or 4 digits of the DID...

Dictation System Access
Dictation System Access
Description
This feature permits voice terminal users to access and control customer-owned dictation
equipment. System 25 can provide an interface to dictation systems that require either an
industry-standard station line port or an Auxiliary Trunk port with contact closure (equivalent
to a push-to-talk switch).
The dictation system is accessed by dialing the designated access code or by pressing a
DSS button on which this access code is stored....

FEATURES AND SERVICES
Voice Terminal Port:
l Assign DSS access buttons, as desired
Hardware Requirements
Customer-provided dictation equipment suitable for connection to a telephone system.
Port on a ZTN78, TN742, or TN763 CP, as required.If the equipment requires a contact
closure, the TN763 and supporting equipment must be used.Detailed connection
information is provided in Figure 2-22.
Descriptions of the SIP (Station Interconnect Panel), TAE (Trunk Access Equipment), and
associated cables and...

Digital Tape Unit (DTU)
Digital Tape Unit (DTU)
The Digital Tape Unit (Figure 2-23) is a RS-232 device used to record administration
translations. The DTU does not encode the translations data as it records, nor does it
require decoding circuitry when playing back (restoring) recorded data. Data is recorded and
transmitted at 1200 bps.
The DTU requires 115V commercial power from a 3-wire grounded outlet. It should be
located on a desk or table top. The recorder is approximately 5 inches wide, 2 inches...

FEATURES AND SERVICES
SYSTEM 25PART OF
CABINETOCTOPUS
CABLEPART OF
SIP
ZTN130C2Z210AC1355A/AF
CPU/MEMADAPT.ADAPT.
LEGEND:
C1-MODULAR CORD (D8W-87) - PEC 2725-07G
C2 - OCTOPUS CABLE (WP90780) - PEC 2720-05P
355A ADAPTER - RS-232 PLUG TO MODULAR JACK - PEC 2750-A24
355AF ADAPTER - RS-232 RECEPTACLE TO MODULAR JACK - PEC 2750-A25
DIGITALTAPE UNIT
Figure 2-24.Digital Tape Unit—On-Premises Direct Connections (Sharing Same AC
Outlet)
2-146 

Direct Group Calling (DGC)
Direct Group Calling (DGC)
Description
Direct Group Calling (DGC) allows incoming calls to be directed to a specific group of
telephones.Up to 32 DGC groups, each including up to 20 members, may be set up. Each
DGC group can have its own individual (unique) announcement. A terminal can be in only
one DGC group. Incoming calls on particular trunks can be directed to a DGC group. These
trunks can also be used for outgoing calls.
DGC groups can be administered as Coverage Groups...

FEATURES AND SERVICES
Considerations
DGC groups are particularly useful when the answering group receives a high volume of
calls. Call completion time is minimized and attendant assistance is not required.
Any number of outside trunks may be administered to feed into a DGC group. A trunk may
feed only one DGC group.
Interactions
The following features interact with Direct Group Calling.
Attendant Console, Switched Loop: When an incoming trunk call rings simultaneously at a
DGC queue and a Switched Loop...