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.
2-229 

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...

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...

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...

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...

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-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)
2-235 

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...

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...

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...