ATT System 25 Reference Manual

FEATURES AND SERVICES
SYSTEM 25
PART OF
CABINET
OCTOPUS     PART OFCABLE
SIP
ZTN130C2
CPU/MEMZ210AADAPT.C1355AFADAPT.C3
Z3A4ADU
C1
CALLACCOUNTING
SYSTEMPART OF
SIPC4Z3A1OR Z3A4C1W1B1858A 400B2ADU
ADAPT.
(NOTE)
C7
2012DTRANS.248BADAPT.LEGEND:
B1- TYPICAL-103A CONNECTION BLOCK*
C1- MODULAR CORD (D8W-87) - PEC 2725-07G
C2- OCTOPUS CABLE (WP90780) - PEC 2720-05PW1 -4-PAIR INSIDE WIRING CABLE*
Z3A1 ADU -EQUIPPED WITH 3-FOOT PLUG-ENDED EIACORD - PEC 2169-001
Z3A4 ADU- EQUIPPED WITH 3-FOOT RECEPTACLE-ENDED EIA...

Callback Queuing
Callback Queuing
Description
This feature provides System 25 users with a simple way to complete calls to busy facilities
(stations or trunk groups), without having to manually repeat the calling procedures.
Callback Queuing puts inside calls to busy stations and trunk pools into a queue. The
maximum number of queue slots is 64, administrable in any combination of inside and
outside calls. After a call is queued for the busy facility, the caller can stay off-hook or go
on-hook. When the...

FEATURES AND SERVICES
While off-hook on a queued call, a single-line user can transfer or conference the
call.
l On-Hook Queuing
The caller can hang up after a call to a busy station goes into queue. The call retains
an association with the on-hook calling terminal, and a callback will alert the on-hook
user when the queued-for station is available.After a single-line terminal user goes
on-hook, the queued call cannot be accessed until a callback attempt occurs. During
the waiting period, the single-line...

Callback Queuing
l Callback Cancellation
The user can cancel a call that was queued manually or automatically. At a multiline
set, if the call is queued off-hook, the user presses the DROP button, then the
queued call button.If the call is queued on-hook, the user must go off-hook, press
the queued call button to become active on the call, press DROP, and then press the
queued call button again.
At a single-line set, the user must get dial tone, then dial the callback cancel access
code #61.
The...

FEATURES AND SERVICES
Considerations
Callback Queuing saves time for users because they can avoid repeated redialing of busy
numbers. It 
allows trunks to be used more efficiently and can reduce the number of trunks
required for a system.
The feature is similar to the Busy-to-Idle Reminder feature but applies to different types of
calls. The two features can both be used to reduce redialing effort.
A single-line voice terminal can queue only one call at a time.
Calls originated by using Personal Line,...

Callback Queuing
Bridging of System Access Buttons:Calls originated on Bridged Access (BA) buttons can
be queued. On callback attempts, only the originator will be rung; all other appearances will
only flash. Any appearance in the bridging arrangement can be used to drop a queued call,
if no other station is off-hook.
If both principal and bridging users are off-hook on a call to a busy facility, only the first one
off-hook can queue the call.
Call Accountability: Any call accountability information...

FEATURES AND SERVICES
Exclusion: pressing the EXCLUSlON button does not drop a queued call. The EXCLUSION
button’s status LED tracks the status LED of the associated button. For example, on a
callback attempt, the EXCLUSION LED will also change from winking to flashing. If the
EXCLUSION button is tracking a conference on hold, it will stay winking with the rest of the
conference. When the callback attempt is answered. the EXCLUSION LED lights steadily to
track all the conference buttons....

Callbaok Queuing
Note: It is highly recommended that queue size be set to either 0 or 64, not to some number
in between.
l Assign the minimum time between callback attempts for inside calls (0 to 120 seconds;
default = 30).
l Assign the minimum time between callback attempts for outside calls (0 to 120 seconds;
default = 30).
Voice Terminal Ports: (Every station has independent control of the number of callback retries and
the number of rings per attempt.)
l Assign the number of callback retries for...

Features and Services
Calling Restrictions
Description
Designated voice and data terminals can be restricted from making certain types of calls. Available
restrictions are:
l Outward Restriction
l Toll Restriction
l Facility Access Restriction
l ARS Restrictions
l Public Station Restrictions
l International Restrictions.
l Interexchange Carrier (IXC) Restrictions
Note: Each of these restrictions is voice terminal oriented, not PDC oriented.
Outward Restriction:
When outward restricted, a station will be...

Calling Restrictions
Equal Access:
Allows equal access to all Interexchange Carriers (IXC) when a station is administered for IXC+1
and/or IXC+011 dialing. Toll restriction checking occurs when an IXC code+1 or IXC code+01 is
dialed. IXC code+0, IXC code+011, and 0+ calls are allowed from toll restricted stations that have
outward calling capability and select a type 701 and 801 trunk administered with “Originating Line
Screening” either via pool access or personal line appearance. This service is...