ATT System 25 Reference Manual

							Third-Party Call Setup
Considerations
With this feature, computer-based telemarketing or other calling applications can set up calls
for the user.
Interactions
The following features interact with Third-Party Call Setup.
Account Code Entry, Forced (FACE): If the source station is FACE-restricted, the third-party
data terminal must prefix the outside destination number with V 0 and an account code.
Coverage: Third-Party Call Setup calls to the source terminal will not be directed to a
coverage station.If the source terminal is not answered before coverage is invoked, the call
is dropped and the NO ANSWER/DISCONNECTED messages are displayed at the third-party
data terminal.
Expert Mode:Refer to the Expert Mode feature description for additional methods in dialing
when using the Third-Party Call Setup feature.
Following/Forwarding: If calls to a source terminal have been redirected to another terminal
(via Following or Forwarding), Third-Party Call Setup calls will be redirected. Note, however.
that the maximum of three ringing cycles (combined cycles at the home and away terminals)
still applies before the system drops the call and displays the NO ANSWER/DISCONNECTED
messages at the third-party data terminal.
Station Message Detailed Recording (SMDR): SMDR records will be generated for Third-
Party Call Setup calls just as if they were placed by the source terminal.
Administration Requirements
l Data Port:
The user’s data terminal may be administered to have a particular source terminal
associated with it. This allows the abbreviated form of dialing when activating the
Third-Party Call Setup feature.
A source terminal may be associated via administration with several third-party data
terminals. A third-party data terminal, however,may be associated with only one
source terminal (voice or data).
In addition, the third-party data terminal can be administered so that calls may be
established for:
— Any voice or data source terminal.
— One associated source terminal only.
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							FEATURES AND SERVICES
—
No source terminals (feature disabled; default)
l AT&T STARLAN NETWORK Access:
Ports administered on the STARLAN INTERFACE circuit pack may not have a
particular source terminal associated with them.Depending on the administration
parameters enabled, third-party data terminals on the STARLAN INTERFACE circuit
pack may establish calls for:
—
Any voice or data source terminal
—
No source terminals (feature disabled; default).
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							Tie Trunks
Tie Trunks
Description
Tie trunks provide
Incoming tie trunk
endpoint. Serviceprivate
communicationslinks between System 25 and other PBXS
calls may be directed to the attendant, to a voice terminal, or to a data
may be either automatic, immediate dial, delay dial, or wink start. Dial
pulse or touch-tone signaling is supported on both incoming and outgoing calls (and may be
different for incoming and outgoing calls).
Considerations
Tie Trunks provide for efficient communications
locations. This provides a private network whosebetween company employees at different
control and utilization can be managed.
Tie trunks can be administered for tandem trunking. This arrangement enables users to call
through an intermediate System 25 to a remote System 25 or other PBX. Refer to the
“Tandem Trunking” feature description for more information.
Interactions
The following features interact with Tie Trunks.
Automatic Route Selection (ARS): Immediate dial tie trunks should not be used in ARS
routing patterns.
Callback Queuing: Tie Trunk groups can be administered for Callback Queueing. If a user
dials a Tie Trunk number and all trunks in the group are busy, the user must either wait for
timeout or dial # to get queuing tone (if automatic queuing is administered) or reorder tone.
Manual queuing can be activated after reorder tone is heard.
Conference: A tie trunk that is part of a conference counts as one of two allowable outside
parties.
Direct Group Calling: Only automatic incoming tie trunks can be directed to a DGC group.
However, dial-in tie trunks can access DGC groups.
Night Service:Dial-in tie trunks cannot serve as Night Service trunks.
Personal Lines: When a dial-in tie trunk is assigned as a Personal Line and the line is used
for outgoing service at the same time that a call is coming in on the line, the terminal may be
connected to the incoming call even though the call is intended for another terminal that
shares the line.For this reason, it is recommended that tie trunks not be assigned as
Personal Lines.
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							FEATURES AND SERVICES
Administration Requirements
Trunk Port:
l
l
l
l
l
l
l
lAssign Trunk Type And Number.
Assign Class Of Service Code (0-15).
Assign Facility Access Code; default = 102.
Allow Dial Access (yes or no; default = yes).
For Auto-in Type Only—Assign To DGC Group (Group Number 1-32, or 0 for none;
default = 0).
Make This a Directed Night Service Trunk (yes or no; default = yes).
Assign Night Service Delay Announcement (1, 2, or 0 for none; default = 0).
Dial-Inward Capability (Tone or Pulse; default = Pulse).
Port Options:
l Set E&M signaling type (Type I Compatible, Type V, Type I).
System Administration must ensure that the port type (wink, delay or immediate
service) and the signaling type (I Compatible, V, or I) is compatible with the distant
PBX.
— Port Type:Wink to Wink
Delay to Delay
Immediate to Immediate
— Signaling Type: V to V
I to I or I Compatible
I Compatible to I or I Compatible
When tie trunks are used with ARS (that is, the tie trunk is accessing the distant PBX
WATS lines), wink or delay type trunks should be used. With immediate type trunks,
the dialed digits may be spilled forward before the distant PBX is ready to receive
them.
System Options:
l Set maintenance busy-tie trunks. By default System 25 detects and removes from
use faulty tie trunks while permitting the remaining working tie trunks in the pool to
be used.
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							Tie Trunks
Hardware Requirements
Requires port interfaces on a TN760B Tie Trunk CP or TN767 DS1 Interface CP.
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							FEATURES AND SERVICES
Touch-Tone and Dial Pulse Services
Description
All touch-tone single-line voice terminals and MET sets are equipped with dial pads that
generate Dual Tone Multifrequency (DTMF) signals when a dial button is pressed. Model
500 Series single-line terminals have rotary dials that generate dial pulses corresponding to
the numbers selected. The 7300H series (MERLIN) voice terminals are equipped with touch
dial pads that generate digitally coded signals when a dial button is pressed.
Each trunk may be independently arranged for either touch-tone or dial pulse service.
Touch-Tone Dial Pads
On outgoing calls on trunks requiring touch-tone signals, cut-through-dialing is provided.
Where the trunk requires dial pulse signals, conversion of the touch-tone signals to dial
pulses is provided until an end of dialing signal is detected. Cut-through is then provided,
and all subsequent digits are sent as touch-tone signals. See the “End-to-End Signaling”
feature description for more information.
Rotary Dials
Voice terminals with rotary dials are required for Power Failure Transfer stations when the
system connects to the CO by way of dial pulse trunks. They are not recommended for
other applications.
Touch Dial Pads
For outgoing calls on trunks requiring touch-tone signals, all dialed digits are converted to
touch-tone signals.If the trunk requires dial pulse signals, the dialed digits are converted to
dial pulses until an end of dialing signal is detected.Cut-through is then provided, and all
subsequent digits are converted to touch-tone signals. See the “End-to-End Signaling”
feature description for more information.
Administration Requirements
Trunk Port:
l Assign trunk Class of Service (COS).COS includes touch-tone/dial pulse
specification.
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							Transfer
Transfer
Description
This feature allows a user to move any call from the user’s terminal to another voice
terminal, then disconnect from the call.
A user can transfer calls either with or without announcement. A multiline terminal user
presses TRANSFER; the party is automatically placed on Special Hold (indicated by a
broken-flutter on the status LED of the call appearance button). The system will
automatically select an idle System Access button. The user may dial the desired number or
select another facility button and dial the call. The user then can do one of two things: (1)
hang up or (2) wait until the called party answers, announce the call, and then hang up. The
held call receives Music-on-Hold, if provided and administered, until the transferring station
hangs up,after which it receives ringback until the transferred-to station answers.
Unanswered transfers will receive the coverage treatment of the transferred-to station.
A Personal Line transferred by a multiline voice terminal user will indicate the Special Hold
status at the transferring voice terminal until answered, and may be reentered if the call is
not answered. Reentering the call will automatically terminate the transfer attempt.
Single-line voice terminal users may transfer calls by flashing the switchhook, which puts the
caller on hold, listening for Recall Dial tone, dialing the second party, and going on-hook
either immediately or after announcing the call to the second party. A call may also be
transferred by setting up a conference and then hanging up.
Considerations
Transfer provides a convenient way to redirect a call to another voice terminal. Attendant
assistance is not required and the caller does not have to redial. While it is possible to
transfer a call without announcement, it is recommended that call transfers be announced.
Interactions
The following features interact with Transfer
Account Code Entry, Forced (FACE): Calls can be transferred in both directions between a
FACE-restricted station and a non-FACE station.
Account Code Entry, Optional: A user may transfer a call to another user, then, instead of
hanging up, enter an account code. Subsequent account code entries will be ignored.
Attendant Console:In most cases, the attendant should not use this feature to extend
incoming calls, but should use the Start button or Selector Console instead. The exception
to this rule occurs if a trunk-to-trunk transfer is desired (see below).
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							FEATURES AND SERVICES
Bridging of System Access Buttons:A call can be transferred from a bridged call
appearance using the usual transfer operations.When a call is held for transfer by pressing
the TRANSFER button, an idle System Access button or an idle System Access-Originate
Only button, if available, is automatically selected by the system for placing the new call. If
neither of these appearance types is idle, the user can manually select a BA button or any
other call button on which to place the new call.
The transfer operation and status indications of the principal’s SA button (and its
corresponding BA buttons) are similar to Personal Line operation with the following
exceptions:Calls can be from/to an inside station or from/to an outside location, and after
the transfer is completed (transferring station goes on-hook) the call will stay at the
principal’s SA button and its BA buttons only if one or more of these stations is bridged to
the call. Otherwise, the call will be removed. An on-hold bridging station or principal is not
considered to be bridged to the call.
Callback Queuing: Queued calls can be transferred. Single-line sets can transfer queued
calls only before going on-hook.The transferring station must wait for the transferred-to
facility to answer before completing the transfer; the transferred-to facility then receives
queuing tone. Queued calls cannot be transferred to a tone (ringing, busy, etc.).
Calling Restrictions:A non-restricted user (typically the attendant) can transfer a CO trunk
to an outward restricted or toll restricted station, giving the station outward service. The toll
restriction class of the transferring station will apply for calls over a transferred trunk.
Coverage: Coverage treatment of the transferred-to station is provided to transferred calls.
When a covering station transfers a covered call to another station, the call will no longer
appear at the covering or the covered station.Note that if you attempt to transfer a call to a
station that you provide coverage for, and that station does not answer, coverage might not
be invoked. (This is one of the reasons why announced transfer is recommended.)
Display: At a station receiving a transferred call, the transfer descriptor “T” is displayed in
position 1 before the transfer is completed.The transferring party’s number and name are
also shown.
Screen 1T785 Jones,B
After the transfer is completed,“T” is removed and the display reverts to a standard
incoming call format.Information about the transferred party is displayed.
Forwarding: Calls transferred by TRANSFER button operation to a forwarding station will be
given normal Forwarding treatment.
Hold: An outside call placed on hold during call transfer receives music-on-hold, if available
and administered.A user attempting to return to a held internal call that has been
abandoned will hear nothing.A user attempting to return to a held CO trunk call that has
been abandoned hears CO dial tone or receives CO intercept treatment until the CO
disconnects.
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							Transfer
Music-On-Hold: An administration item allows Music-On-Hold to be enabled or disabled for
“Special Hold.”
Park: Single line voice terminals cannot transfer parked calls.
Pickup: A transferred call maybe answered via the Pickup feature.
Public Station: If a non-restricted user (typically the attendant) transfers dial tone to a PUBLIC
station, the restriction level (level 5) of the PUBLIC phone will apply, unless higher restriction level
stations remain on the call with the PUBLIC station. If a call is transferred from a PUBLIC station to
a non-PUBLIC station, then the non-PUBLIC rule will apply.
Remote Access: Remote Access callers cannot use the Transfer feature.
Trunk-To-Trunk Transfer: A trunk call may be transferred to another trunk. Refer to the “Trunk-
To-Trunk Transfer” feature description for additional information.
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							Features and Services
Transfer To Data
Description
This feature allows multiline voice terminal users to originate or answer a call from their voice
terminals and then establish a data connection by transferring the call to a data terminal.
Note: Single-line voice terminals cannot be used to establish a data connection by trans-
ferring a call to a data endpoint.
(Refer also to the overview of the system’s data features provided in the “Data Services Overview”
description.)
Data terminal calls can be set up from a multiline voice terminal with a DATA button. The DATA
button is associated by Data Dial Code (DDC) with a digital data endpoint. A separate DATA button
must be provided for each data terminal that the voice terminal can transfer calls to.
The DATA button status LED provides status indications for the data endpoint:
l Dark—Data endpoint is idle
l Winking—Data endpoint is reserved
l Flashing—Data endpoint is being alerted to an incoming call
l Steadily Lighted—Data endpoint off-hook (busy).
The DATA button status LED will wink only when a voice terminal reserves a data endpoint by Data
Call Preindication.
Data Call Origination Using Transfer to Data
A voice terminal user, after calling a DDC or a PDC (to reach an analog data endpoint) receives
either answer tone or called party answer, respectively. The user then transfers the call to the
associated data terminal by pressing DATA and hanging up. The called party may also use Transfer
To Data to transfer the call to a data terminal, or may press the Data button on an associated
modem.
An inside call cannot be transferred via Transfer To Data until the far end answers.
If a handshake failure occurs after Transfer To Data, the data call will be disconnected and the data
terminal left in the idle (on-hook) state.
Note: Even if the associated data port is optioned for autobaud, the call will be set up at the
highest common speed that the calling and called data terminals are administered for,
independent of the current data terminal settings.
2-344November 1995