ATT System 25 Reference Manual

Coverage, Group
terminal. If there is no idle Cover button on any covering terminal, either individual or group,
the call will not receive coverage and the calling party will receive Busy Tone.
Calls sent to coverage will continue to ring at single-line sender terminals but will cease
ringing at multiline sender terminals.
In the latter case, the calls will remain on the incoming
call appearance button, and that button’s status LED continues to reflect the status of the
call. In particular, covered calls...

FEATURES AND SERVICES
Considerations
Coverage provides a way to redirect calls to alternate answering positions. The feature is
versatile enough to permit suitable alternate answering arrangements for virtually every level
of employee.Special functions, such as the Send All Calls feature, accommodate the day-
to-day variations that occur in an employee’s work schedule.
Interactions (Standard Group Coverage)
The following features interact with Standard Group Coverage.
Attendant Console, Direct Trunk: If...

Coverage, Group
When forwarding to an outside number, coverage may only occur in one case: the forwarding
had been activated using a trunk group’s facility access code (not ARS), the forwarding
cannot be completed because the trunk group is busy, and the forwarding station is not
busy. In this case, the call will ring at the forwarding station and its coverage stations.
Hands-Free-Answer On Intercom: An incoming (inside) call will not receive coverage if auto-
answer is activated, since the set will...

FEATURES AND SERVICES
Callback Queuing: Callback calls to the originator do not send ring signals to its coverage
stations. If a call is queued for a station,then one of the coverage stations becomes
available, the call remains queued for the originally-dialed station.
Direct Station Selection (DSS): A DSS button can be assigned to a DGC Coverage Group.
The button lights whenever all DGC members are busy.
Flex DSS: A Flex DSS button can be assigned to a DGC Coverage Group.
Forwarding:When a station has...

Coverage, Group
Administration Requirements (Standard Group Coverage)
System:
l Provide Coverage ringing on internal calls (yes or no; default = yes).
If “no”, covered calls will flash but not ring at covering stations on internal calls.
l Number of rings before Coverage ringing starts on no answer (0-31; default = 2).
The status LEDs on Group Coverage buttons at covering stations begin flashing
immediately in all cases. Ringing, in addition to flashing, is always sent on external
calls, though it may...

FEATURES AND SERVICES
Coverage, Individual
Description
This feature is similar to Group Coverage, covered in the preceding feature description. The
primary difference is that Individual Coverage is a one-on-one type coverage between pairs
of stations.
An Individual Coverage (COVER-IND) button can be assigned on multiline voice terminals to
cover calls to a specific (single) voice terminal.The covering station can answer covered
calls by selecting COVER-IND. Each COVER-IND button can be programmed to ring...

Coverage, Individual
Interactions
The following features interact with Individual Coverage.
Attendant Console, Direct Trunk: When a coverage call rings at a busy Attendant Console,
the attendant receives a single burst of ringing.If the call is still unanswered when the
attendant hangs up the other call, the Attendant Console will resume ringing.
Bridging of System Access Buttons:An incoming call is given individual coverage according
to the coverage specified for the principal.Calls appearing on Bridged...

FEATURES AND SERVICES
Administration Requirements
Voice Terminal Port:
lIndividual Coverage button (button function # 12):
—
Individual Coverage PDC (1-9999).
—
Allow Ring (yes or no).
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DS1 Facility Interface
DS1 Facility Interface
Description
The DS1 facility interface feature provides connectivity between System 25 and a T1 facility.
The DS1 facility is a transmission system to transport digital signals of the DS1 format. The
System 25 forms voice signals using the DS1 format. By using the DS1 format the following
advantages are provided; calls to other digital PBXs or central offices remain digital and
signals don’t need to be converted to analog for acceptance by the connecting tie...

FEATURES AND SERVICES
Signaling Types
Signaling types refers to signaling used by DS1 on the T1 facility. Two signaling types can be
used in System 25, Robbed-bit and Common Channel.
Robbed-bit signaling (RBS) robs or replaces the least significant bit (of each DS0 channel’s
8-bit word in every 6th frame) with that channel’s signaling information. For D4 frame format,
that means the 6th and 12th frame carry RBS. For ESF frame format, this means the 6th,
12th, 18th, and 24th frames carry RBS. Robbed-bit...