ATT System 25 Reference Manual

							Messaging Services
Hardware Requirements
The Z3A Message Waiting Indicator (MD), if available, can be used on single-line voice
terminals not equipped with built-in Message LEDs.
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							FEATURES AND SERVICES
Modem Pooling
Description
Allows switched data connections between digital data endpoints and analog data endpoints.
(Refer also to the discussion of the system’s data features provided in the “Data Services
Overview” feature description.)
Data transmission between digital and analog endpoints requires a conversion resource
since the digital format used by the data module is not compatible with the modulated signals
of an analog modem.The conversion resource translates the digital signals from the digital
endpoint into analog signals and vice versa.
The modem pool is a single group of up to 12 conversion resources (3 Cabinet system) with
the characteristics of a 212A full duplex asynchronous modem that can operate at speeds of
300 and 1200 bps.
The Modem Pooling feature operates transparently to the user whenever possible. In most
cases, when a digital endpoint is connected to an analog trunk or port, the system adds a
conversion resource without any explicit action by the user.
A voice terminal user who plans to use an analog modem to call a digital endpoint must first
enter the Modem Request Code before dialing the digital endpoint. This is because the
system assumes that a voice call to a digital endpoint will be transferred to data via the
Transfer To Data feature.
A DID call terminating on a digital endpoint will be assigned a modem resource, if available.
Otherwise, the call receives Reorder tone.
For each situation that requires a conversion resource, the system:
1.
2.
3.
4.
Determines if a resource is required by examining the types of endpoints that are to
be connected together or by user indication.
Once it is determined that a conversion resource is needed, it is reserved. The user
receives Reorder Tone (or the “NO MODEMS - TRY AGAIN” message) if a resource
is not available. The system queries the data port to determine whether its options
are compatible with those supported by the modem pool. If they are not (e.g., 9600
baud and Permit Mismatch is not enabled), the originating user receives intercept
treatment (i.e., INCOMPATIBLE FAR END) and call setup is abandoned.
At data connection time, the conversion resource is seized and placed in the
connection.
The call is disconnected within 15 seconds if the conversion resource does not
successfully handshake with both endpoints.
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							Modem Pooling
Conversion resources are requlred for:
l Data Terminal Dialing: To establish a data connection for calls originated via
Terminal Dialing to intrapremises analog data endpoints.
l Incoming Trunk Calls: To establish a data connection between an incoming trunk call
and a digital endpoint. Incoming trunk calls that are answered at a voice terminal can
be transferred to a data endpoint using the Transfer To Data feature.
l On-Premises Data Calls: To establish a data connection between an on-premises
analog data endpoint and an on-premises digital endpoint.
l Outgoing Trunk Calls: To establish a data connection between an off-premises
analog endpoint (modem) and an on-premises digital endpoint.
Considerations
Modem Pooling provides a pool of conversion resources that increases data call flexibility.
Conversion resources allow analog data endpoints, using modems, to communicate with
digital data endpoints (using data modules). Also, modem pooling reduces costs by sharing
resources.
Interactions
The following features interact with Modem Pooling.
Automatic Route Selection:Data calls may be queued. See Table 2-I, “PLEASE WAIT”
message.
Calling Restrictions:If a terminal is toll or access restricted, the modem resource is
released when the user receives intercept treatment.
Direct Group Calling:Modem pooling supports calls to data endpoints that are part of a
DGC group. While an incoming data call is in the DGC group queue, the caller hears
Ringback Tone.The conversion resource is inserted if the call is completed to a digital
endpoint.
Station Hunting:Modem Pooling supports calls to data endpoints that are part of a station
hunting group.
Station Message Detail Recording (SMDR): SMDR records do not reflect modem resource
usage. Interpremises data calls using a conversion resource are reported as data calls on
the SMDR call record.
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							FEATURES AND SERVICES
Administration Requirements
System (Pooled Modems):
l Modem Request Code (1-9999; default = 820). Allows users to indicate a need for a
conversion resource on a data call originated at an analog data endpoint.
l Receiver Responds To Remote Loop (yes or no; default = yes). When active, Data
Set Ready is asserted when the modem is in an analog loop test mode.
l Disconnect On Loss Of Carrier (yes or no; default = yes). When active, a loss of the
received carrier will cause the modem to terminate the call.
l CF-CB Common (yes or no; default = yes). When active, Clear to Send turns off if
Carrier Detect turns off. When a call is being established, Clear to Send and Carrier
Detect are not allowed to turn on until carrier has been received and the Clear to
Send timer has timed out.
l Disconnect On Received Space (yes or no; default = yes). When active, the modem
will disconnect after receiving a “Space”signal of approximately two seconds
duration.
l Send Space On Disconnect (yes or no; default = yes). When active, the modem,
upon receiving a negation of Data Terminal Ready, sends approximately four
seconds of “Space”signal and then disconnects.Without this option active, the
modem, upon receiving a negation of the Data Terminal Ready signal, disconnects
immediately.
Hardware Requirements
One TN758 Pooled Modem CP provides two conversion resources. Two TN758s are allowed
per system cabinet, for a total of 12 conversion resources in a 3-cabinet system.
2-232 
						

							Music-On-Hold
Music-On-Hold
Description
This feature provides music or other audible indication to a held party on an outside line
On an outside call, if the user places the call on Hold, or after a call into a DGC group
receives the delay announcement, music is provided to the calling party. If a caller receives
music because all members of a DGC group are busy, when a group member becomes
available to answer the call, music is removed and the calling party is connected to the DGC
member.
When a multiline voice terminal user places a call on hold, the status LED of the held line
winks and music is provided to the held party. The user may return to the held party by
pressing the button associated with the held call.The status LED lights steadily, music is
removed from the line, and a talking connection is again established.
When a single-line voice terminal user places a call on hold by pressing the switchhook
momentarily, the calling party is connected to music or a recording. The station may return
to the held call by pressing the switchhook a second time. The music is removed from the
line and the held party is reconnected to the user.
Music-On-Hold is not invoked when a conference call is placed on hold or when the
attendant “Start” facility is used to place a call on hold.In addition, Music-On-Hold is not
provided for data calls or inside calls.
Considerations
Music-On-Hold lets the waiting party know that he or she is still connected.
Users of equipment that rebroadcasts copyrighted music or other material may be
required to obtain a copyright license from a third party such as ASCAP or BMI.
Interactions
The following features interact with Music-On-Hold.
Attendant Splitting One-Way Automatic:Music-On-Hold is not provided when the attendant
presses START.
Conference: When a station user sets up a conference, the other parties are put on “special
hold” until being connected together.If Music-On-Hold has been administered for the
special hold condition, the conferees hear music during the hold interval.
Direct Group Calling: An incoming call to a busy DGC group that provides a recorded delay
announcement will receive music after the announcement.
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							FEATURES AND SERVICES
Park: Parked calls (except parked conferences) receive music.
Transfer: When a station user transfers a call to another station, the transferred party is put
on“special hold”until the process has been completed. If Music-On-Hold has been
administered for the special hold condition, the transferred party hears music during the hold
Interval.
Administration Requirements
Special Feature Port:
l Assign a port on a TN742 Analog Line or ZTN78 Tip Ring Line CP as required for the
music/message source (special feature port type = 254).
l Allow Music-On-Hold for special hold (yes or no).
Hardware Requirements
A music source is needed to support the Music-On-Hold feature. The interface is a port on a
ZTN78 Tip Ring Line CP or TN742 Analog Line CP.
Detailed connection information is provided in the following figures:
l Figure 2-33—Music-On-Hold Equipment Connections (FCC Registered)
l Figure 2-34—Music-On-Hold Equipment Connections (Non-Registered).
Descriptions of the SIP (Station Interconnect Panel), TAE (Trunk Access Equipment), and
associated cables and adapters, as shown on the figures, are provided under the heading
“connectivity” in Section 4.
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							Music-On-Hold
SYSTEM 25
CABINET
PART OF
OCTOPUS
CABLE
PART OFSIPTN742C2
SIPW1W1C5>MUSICOR>ADAPT.MOHB1SOURCE
ZTN78
LEGEND:
TN742 -
ZTN78 -
B1 -
C2 -
C5 -
W1 -
MOH -
* -
ANALOG LINE CPTIP RING CPTYPICAL-103A CONNECTING BLOCK*OCTOPUS CABLE (WP90780) - PEC 2720-05P
MODULAR CORD (D4BU-87)
4-PAIR INSIDE WIRING CABLE*
KS-23395 MUSIC-ON-HOLD INTERFACE UNIT - PEC 62517
FURNISHED BY INSTALLER
Figure 2-33.Music-On-Hold Equipment Connections (FCC Registered)
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							FEATURES AND SERVICES
SYSTEM 25
CABINET
PART OF
OCTOPUS CABLE
PART OF SIP
TN742
C2ORSIPW1ADAPT.MOH
ZTN78W1
36A VOICEW1B1C6MUSIC
COUPLERSOURCE
W1
2012D
TRANSFORMER
LE6END:
TN742 -ANALOG LINE CP
ZTN78- TIP RING CPB1 -TYPICAL-103A CONNECTING BLOCK*C2 - OCTOPUS CABLE (WP90780) - PEC 2720-05P
C6 - SINGLE-ENDED MODULAR CORD, D4BYW1 -4-PAIR INSIDE WIRING*
MOH -KS-23395 MUSIC-ON-HOLD INTERFACE UNIT
2012D TRANSFORMER - 15-18V AC SOURCEPEC 62513
36A
* -
Figure
VOICE COUPLER -MUSIC SOURCE INTERFACE
FURNISHED BY INSTALLER
2-34. Music-On-Hold Equipment Connections (Non-Registered)
2-236 
						

							Night Service
Night Service
Description
Allows users to answer incoming calls on specified trunks when the attendant is not on duty
There are two types of Night Service (NS):
l Directed NS: Redirects incoming calls on specified trunks to designated voice
terminals.
l Trunk-Answer-from-Any-Station (TAAS) NS: Allows users to answer incoming calls
on specified trunks by dialing the Night Service access code.
Both types of NS may be provided (specified on a per-trunk basis).
To obtain Night Service, the system must be equipped with an Attendant Console, and the
console administered with a NIGHT button. In a system with two Attendant Consoles, both
consoles may be assigned a NIGHT button.Either attendant can press NIGHT to activate
Night Service.The LEDs of both NIGHT buttons will light to indicate that the system is in the
Night Service mode.Pressing NIGHT a second time (by either attendant) deactivates Night
Service and turns Off both LEDs.
Directed NS:
Allows an incoming trunk call to be directed to up to four designated voice terminals.
Different trunks may be directed to different voice terminals.
When the attendant presses NIGHT, incoming calls on trunks administered to receive
Directed NS treatment will automatically be routed to the designated voice terminals (all
designated NS stations ring simultaneously). Calls not answered within a specified number
of rings will receive a Night Service delay announcement, if available.While at the
announcement, they may be bridged onto by going off-hook at a station with a line
appearance.The announcement is dropped at this point.If all Directed NS stations for a
given trunk are busy (all System Access buttons busy on multiline sets), calls go to the
announcement immediately. Directed NS calls do not hunt or receive coverage, but they can
be picked up via the Pickup feature.
Personal Line calls that are directed to NS will also ring at the Personal Line appearances
and receive normal coverage.
Incoming calls receiving Directed NS treatment will not activate external alerting devices
associated with TAAS NS and cannot be answered by dialing the NS access code.
Directed NS is activated under the following conditions:
l An attendant has pressed NIGHT on either console.
l Directed NS has been administered for the trunk.
l Stations have been administered to receive NS calls.
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							FEATURES AND SERVICES
Note that at least one station must be designated as a NS receiver for this feature to work
properly. If only an announcement is required, administer the announcement device as a
station and make this station the NS receiver.
Refer to the“Night Service Delay Announcement”feature description for additional
information on the delay announcement.
Trunk-Answer-from-Any-Station:
Allows any user to answer NS calls.Incoming trunk calls activate an external alerting device
such as a bell (“External Alerts”feature). A user can then dial the NS access code and
answer the call. Night Service is activated under the following conditions:
l An attendant has pressed NIGHT on either console.
l TAAS NS has been administered for the trunk.
l A NS external alert has been installed and administered.
Note that TAAS NS calls will not activate the delay announcement associated with Directed
NS.
Considerations
Directed NS provides a means of ensuring that Night Service calls are answered by
designating individual voice terminals to receive the calls.In noisy environment, for example,
NS via external alerting devices may not be practical. Directed NS provides a solution to the
noise problem.Also, Personal Line calls to executives can receive special handling by
providing Directed NS.Calls continue to ring at the attendant position or Personal Line
appearances when NS is activated.They also ring the external alert (TAAS) or Directed NS
station.
Trunk-Answer-from-Any-Station provides the capability for any user to answer NS calls.
Interactions
The following features interact with Night Service.
DID Trunks: DID trunks are not assignable to NS. A DID call will ring at the appropriate
station whether NS is activated or not.
Following/Forwarding:Directed night service calls will not be given following or forwarding
treatment if the PDC is signed in at another station.
Remote Access: Remote Access trunks (dedicated or shared) cannot be given Directed or
TAAS Night Service treatment.
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