ATT System 25 Reference Manual

External Alerts
External Alerts
Description
External Alerts provide standard station ringing at locations away from the called stations.
This feature can be used to activate an external alerting device such as a bell.
External Alerts supports the Trunk-Answer-from-Any-Station (TAAS) form of Night Service.
The feature can be used in conjunction with voice terminals located in noisy environments
and large areas such as warehouses, etc.The alerting device is activated whenever the
associated station is...

FEATURES AND SERVICES
Hardware Requirements
Order line-activated alerting devices (e.g., bells) as required.
An alerting device operating on a line separate from a terminal requires a port interface on a
ZTN78 or TN742. Refer to Figure 2-26 for connection information.
Order the Supplemental Alert Adapter (PEC 2301-SAA) for controlling a remote alerting
device. A Supplemental Alert Adapter is installed in the line between the port CP and the
user’s MERLIN System terminal. The line requires a ZTN79 ATL...

External Alerts
SYSTEM 25PART OF
CABINETOCTOPUS
CABLEPART OF
SIP
ZTN79
C2SIPW1C1
B1 ADAPT.T1LINE CP
S1C8ALERTER C.U. V.T.
ALERTA1
LEGEND :
A1 -
B1 -
C1 -
C2 -
C8 -
S1 -
T1 -W1 -
*-
SUPPLEMENTAL ALERT ADAPTER - PEC 2301-SAA
TYPICAL -103A CONNECTING BLOCK*
MODULAR CORD (D8W-87)
OCTOPUS CABLE (WP90780)
MODULAR CORD (D4BU-87)
EXTERNAL ALERT
HYBRID TYPE TERMINAL
4-PAIR INSIDE WIRING CABLE*
FURNISHED BY INSTALLER
Figure 2-27.Supplemental Alert Adapter Connections
2-181 

FEATURES AND SERVICES
Following
Description
This feature allows users who
at other inside voice terminals.are away from their own voice terminals to receive their calls
Following is functionally equivalent to internal Forwarding.
In order to have their calls follow them, users sign in their PDCs at the terminals where they
will be located temporarily. A call coming into the“home” terminal is redirected to the
terminal where the PDC is signed in (the “away” terminal). Signing in a PDC at a terminal...

Following
Calls Placed to A PDC:
Calls to a PDC that is not signed in at an“away” terminal are directed to the home terminal
and receive that terminal’s normal hunting or coverage treatment.
If a PDC is signed in at an away terminal, calls placed to the PDC fall into one of the
following categories:
l The general case—
calls placed from terminals other than the away terminal
l A special case—call placed from the away terminal.
(1) The General Case: The call will first be directed to the away voice...

FEATURES AND SERVICES
instead be provided Reorder Tone.Finally, if the FPDC is not signed in, and if the attendant
position is not administered to handle these calls, then the calling party will receive Reorder
Tone.
For non-DID calls if an invalid FPDC is dialed, then the calling party will receive Reorder
Tone. If a DID call does not match any assigned number in the dialing plan, it will be
directed to the attendant or to Reorder Tone, as administered.
Considerations
Following provides maximum...

Forwarding
Forwarding
Description
This feature allows users to direct their incoming calls to another (forwarded-to) voice
terminal where they will be located temporarily. Calls can be forwarded to inside stations or
to locations outside System 25. Figure 2-28 is a simplified block diagram of this feature.
CALLINGFORWARDINGFORWARDED-TO
STATIONSTATIONSTATION
Figure 2-28.Stages of Call Forwarding
Forwarding is similar to the Following feature.Both features enable users to answer their
calls at another...

FEATURES AND SERVICES
Waiting is administered at the forwarded-to station.
Forwarding Calls to Locations Outside System 25
The user activates Forwarding to an outside station in one of the following ways:
l By dialing feature access code #70, the single-digit ARS access code, and the
forward-to number, then hanging up after hearing confirmation tone.
l By dialing feature access code #70, a pooled facility (trunk) access code, and the
forward-to number, then hanging up after hearing confirmation tone.
The...

Forwarding
After dialing the Remote Access trunk and the barrier code, the caller receives second dial
tone. The caller then enters access code #70 and the PDC of the forwarding station;
confirmation tone followed by silence is returned if a valid PDC was dialed. Finally, the
remote caller dials the outside forward-to number and hears confirmation tone.
To cancel Remote Access Forwarding, the remote caller repeats the activation procedure but
substitutes “0” for the outside forward-to number....

FEATURES AND SERVICES
A given station can receive forwarded calls from any number of other stations.
Note:When incoming trunk calls are forwarded to outside locations, severe
attenuation of the voice signal may occur.
Interactions
The following features interact with Forwarding.
Account Code Entry, Forced: Stations with this feature administered for all calls cannot
forward calls to any outside numbers.
Stations with this feature administered for “dial 0 or
1” calls can forward calls to any outside...