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 confirmation tone, and the connection is dropped. If the dialed station has no
Message LED or if the extension number is invalid, the attempt is denied and the caller gets
reorder tone.
In conjunction with Dial Access service, each Direct Group Calling (DGC) group in the system
may have one station assigned as receiver of message waiting indications. If a caller dials
the number of a DGC group, the system routes the message waiting request to the extension
of the designated message waiting indication receiver.
The procedure for turning off a Message LED parallels the turn-on procedure. The user gets
dial tone, then dials deactivation code #91 and the extension number of the target station.
Confirmation tone is returned if the attempt is successful, reorder tone if it is not.
Considerations
Dial Access to Message Waiting Indicators provides users with a way to notify any other
terminal that a message is waiting.
This feature does not apply to the feature buttons/LEDs administered for Station-to-Station
Message Waiting.
Interactions
Dial Access to Message Waiting Indicators can coexist with the other messaging services in
System 25. Careful management is essential so that users know where to retrieve their
messages.
The following feature interacts with Dial Access.
Display: When a display telephone set user dials #90 (or #91) followed by an extension
number to light (or extinguish) a Message LED at some station, the dialed digits are
displayed. A confirmation of Message LED activation or deactivation is not displayed.
Hardware Requirements
Only terminals with built-in message waiting indicators (designated MSG or MESSAGE) or
Z3A Message Waiting Indicator adjuncts can be signaled by this feature.
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							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 will ring at the signed-in terminal and may (optionally) ring at
the attendant position when not signed in anywhere.
Data extensions on System 25 are assigned Data Dial Codes (DDCs).
Dial Code Assignments
System 25 dial codes are as follows:
Assignable System 25 dial codes may have 1, 2, 3, or 4 digits. These include voice terminal
PDCs, data terminal DDCs, Direct Group Calling (DGC) Groups, Paging Access, Attendant
(Selector Console) Park, Night Service, Modem Request, Automatic Route Selection Access,
Facility Access (trunk group), and Dictation System Access codes.
System 25 fixed dial codes are:
l   0 — Attendant access
l   V 1, V 2, V 3 — Reserved
l   V 4 — Activate Make-Busy for DGC group member
l   V 5 — Park
l   V 6 — Deactivate Make-Busy for DGC group member
l   V 7 + 0 — Group Pickup Answer
l   V 7 + PDC — Directed Pickup Answer
l   V 8 + PDC — Park Retrieval
l   V 9 — Camped-On/Call Waiting Call Retrieval
l   V V 0 — Account Code Entry
l   V V PDCPDC — Sign in PDC (Following and Forwarding)
l   V V PDC0 — Sign out PDC (Following)
l   V V 0 — Sign out all PDCs (Following)
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							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 — Activate Dial Access to Message Waiting Indications
#91 — Deactivate Dial Access to Message Waiting Indications
#92 — Activate Leave Word Calling
# — End of dialing
# # — Sends a “ # ” (in programmed numbers)
# V — Sends a “ V ” (in programmed numbers)
# # PDC — Call Accountability.
The maximum number of dial codes available for a System 25 is 600. Each assigned code is
stored individually in memory.
The dial codes assigned in the system must be completely unambiguous. For example, a
dialing plan that contains the number“20” cannot contain the numbers “2,” “200-209,” or
“2000-2099.”
PDC to Voice Terminal Association
During installation, each voice terminal is assigned one PDC that serves as its extension
number. These are referred to as “assigned” PDCs, and the associated terminals are called
home stations. Additional “floating”PDCs (FPDCs), may be assigned in a system. At the
customer’s option, floating PDCs may have the attendant position assigned as their home
station (i.e., calls to FPDCs will be directed to the attendant when they are not signed in
anywhere). A maximum of 200 assigned PDCs and 300 FPDCs may be allocated in a system.
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							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 number. For example, the code
associated with the DID number “NXX-2157” will be 57, 157, or 2157.
All dial codes in the system that are associated with DID numbers should have the same
number of digits.However, there is no requirement that all PDCs, DDCs, DGC access
codes, or facility access codes be associated with DID numbers.
Voice Terminal Directed Features
Directed Night Service, DGC calls, Personal Line Calls, Manual Signaling, Station Message
Waiting, Automatic Intercom,and Outward/Toll Restriction are associated with specific
terminals (stations), not with PDCs. This means that these features do not move with a PDC
when it is signed in at another voice terminal.
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							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.
Considerations
This feature allows users to access and control a shared dictation system. A dial dictation
system is essentially a sophisticated tape recorder that can respond to touch-tone signals for
physical control.For instance, pressing the digit six might cause the dictation system to
rewind its tape; pressing the digit three might cause the dictation system to play back its
tape.
Most modern dial dictation systems interface to System 25 through an industry-standard
station line port.However, some dictation systems require contact closure for recording
control and must interface to System 25 through a port on an Auxiliary Trunk CP (TN763) by
means of an Auxiliary Trunk Interface and a Paging/Dial Dictation Interface.
If a dictation system may be optioned for either of these interfaces, the preferred interface is
the station line port.
Interactions
The following feature interacts with Dictation System Access.
Direct Inward Dialing (DID): A DID number may match the dictation system access code.
This allows an outside caller to access the dictation equipment.
Administration Requirements
System:
l Dial dictation equipment requires a suitable port to interface to System 25. A port on
a ZTN78 Tip Ring Line or TN742 Analog Line CP is the preferred interface if the
dictation equipment can be optioned for a station port. A port on a TN763 Auxiliary
Trunk CP and its associated equipment must be used if the dictation system requires
a separate contact closure for proper operation.
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							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 adapters are provided under the heading “Connectivity” in Section 4
of this manual.
SYSTEM 25
CABINET
PART OFOCTOPUS
SIP
PART OFCABLE
TN742C2SIPW1>C5DICTATION
ORB1ADAPT.> EQUIPMENTZTN78(NOTE)
LEGEND:
TN742 -ANALOG LINE CP
ZTN78- TIP RING LINE CP
B1 -TYPICAL-103A CONNECTING BLOCK*
C2 - OCTOPUS CABLE (WP90780) - PEC 2720-05P
C5 - MODULAR CORD (D4BU-87)
W1 -4-PAIR INSIDE HIRING CABLE*
*-FURNISHED BY INSTALLER
NOTE:
Figure
IF CUSTOMER DICTATION EQUIPMENT REQUIRES A CONTACT
CLOSURE, A TN763 AUXILIARY TRUNK CP MUST BE USED. REFER
TO THE “PAGING SYSTEM ACCESS” FEATURE DESCRIPTION FOR
TYPICAL CONNECTION INFORMATION.
2-22.Dictation System Connections (FCC Registered)
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							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 high,
and 10 inches long.
As shown in Figure 2-24, the DTU must be directly connected to port #3 on the Call
Processor (ZTN82 or ZTN128) CP. Remote and switched connections are not supported.
Maximum cabling distances are provided in Section 5, “Technical Specifications.”
115V AC
POWER
CABLE
EIA
RS-232C
CONNECTOR
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3-WAY POWER
DIGITAL RESET
COUNTER
(TOP VIEW)
Figure 2-23.Digital Tape Unit
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							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 receivers. Refer to the “Coverage,
Group” feature description for details.
Calls to a DGC group hunt in a circular manner, starting at the terminal following the last one
to receive ringing (whether answered or not), and will ring at the next idle terminal in the
group. On multiline voice terminals the calls arrive on a SYSTEM ACCESS button (LOOP
button on a Switched Loop Attendant Console).
If all group members are busy (off-hook), an outside call is queued and the caller receives
ringback tone.If the DGC has a delay announcement, it is played after a specified amount of
time (up to 255 seconds). The caller is subsequently put on hold (in queue) and will receive
Music-On-Hold if available. If the system is not equipped with a delay announcement, the
call will begin to ring at all line appearances after the specified interval.
An inside caller dials a DGC access code to reach a DGC group. If all members of the group
are busy, the call will go into a queue if Callback Queuing is activated either automatically or
manually, otherwise, the call will not queue and the caller will receive Busy Tone.
Once the call begins to ring at a group member’s station, it will not receive announcement
service or ring at a line appearance.For this reason, it is important that DGC members log
out (as described below) when they will be away from their desks.
The attendant can camp-on multiple outside (trunk) calls when all members of the group are
busy. Group members do not receive camp-on indication. The camped-on calls will be
queued, and are eligible for the DGC delay announcement. If no delay announcement is
available, the calls will return to the attendant console after a specified number of rings.
DGC group members may withdraw from the group (log out) by going off-hook and dialing
V 4. To reenter the group (log in), the member goes off-hook and dials V 6.
An off-hook multiline terminal or attendant console (even if busy on only one SYSTEM
ACCESS or LOOP button) appears busy to DGC calls.However, terminals other than the
SLAC may receive other (non-DGC) calls while active on a DGC call.
Direct Group Calling groups may be used for data applications to access host ports and the
STARLAN Interface CP. The System Administrator may disable queuing for data DGC
groups, if desired.Delay announcements and music-on-hold are not provided for data
groups.
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							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 Attendant Console queue, it may be answered by either,
depending on who answers first.
Attendant Direct Extension Selection: When all stations in a DGC group are busy, the status
LED on the Selector Console lights steadily.
Bridging of System Access Buttons:DGC calls arriving on System Access buttons at a
principal station can receive bridging treatment at a bridging station.
Callback Queuing: Inside calls to busy DGC groups can be queued. Queuing is not allowed
if all members of the DGC group are logged out. A multiline DGC member with a queued call
and a single-line member with an off-hook queued call are considered busy.
Coverage: When a call rings at DGC station that has Coverage, the call will receive that
station’s coverage.Calls directed to a busy DGC group do not receive coverage. Instead,
after a predefined amount of time (up to 255 seconds), a trunk call will be transferred to a
delay announcement (if provided), or ringing will be transferred to all button appearances of
the line and the SLAC queue (if trunk has ringing enabled).
Display: A logged-in Direct Group Calling (DGC) group member can view the number of calls
waiting to be serviced by the group. The display is continuously updated for all members. A
digit, 0 through 9 or“!” for 10 or more, appears in position 16. DGC queue values are not
displayed at a SLAC assigned to a DGC group; the attendant’s display always contains the
number of calls waiting in the attendant queue.
Direct Group Calling Delay Announcement:Provides a recorded announcement to an
outside (trunk) caller who has been placed in queue for a DGC group.
Direct Inward Dialing: An incoming DID call may match a DGC group access code.
Direct Station Selection (DSS): A DSS button can be assigned to a DGC group. The
associated LED lights steadily when all stations in the group are busy.
Modem Pooling:Modem Pooling supports calls to data endpoints that are part of a DGC
group. While an incoming data call is in a DGC group queue, the caller receives ringing. The
conversion resource is inserted if the call is completed to a digital endpoint.
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