Specifications

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Behind PBX/CENTREX lines
Individual outside lines may be defined as extensions
of a larger exchange. Special parameters, such as flash
time, may be programmed to match the requirements
of the larger exchange.
Branch routing (networking digital systems)
Calls can be routed among different systems, branches,
or departments of an organization at different locations
with the press of a button. This feature takes advantage
of the sophisticated networking capabilities of the
DIGITAL family of systems, including DPNSS and
QSIG corporate-wide networking (See DPNSS
networking and QSIG networking under Private
networking features, below).
BRI (ISDN Basic Rate Interface)
The DIGITAL system supports ISDN Basic Rate
Interface to both outside lines and internal lines. On
internal BRI lines, each S-bus supports two TEIs
(terminal equipment identifiers), and the DIGITAL
system tracks calls to the appropriate TEI. This enables
two incoming or outgoing calls to be handled
simultaneously at the same DN.
Outside lines: The DIGITAL systems
support ISDN Primary Rate Interface (PRI)
outside lines, using the ETSI (Euro-ISDN),
NT-DMS100, AT&T-4ESS or AT&T-5ESS
standards, and Basic Rate Interface (BRI)
outside lines, using the ETSI, NI1-DMS100,
or NI1-5ESS standards, depending on public
network support. The DIGITAL systems
also support PRI and BRI ISDN
supplementary services such as Call-By-Call
Integrated Service Access (PRI only), Caller
Line Presentation (CLIP), Caller Line
Restriction (CLIR), and Direct Inward
Dialing (DID), where supported by the public
network. See ISDN Features, below.
Terminal lines: The DIGITAL system
supports Basic Rate Interface for ISDN
terminals, using the ETSI (Euro-ISDN) or
AT&T standards. This facilitates connection
to the Internet, video conferencing, and
communications with other ISDN terminals
external to the DIGITAL system. It is
possible to use both B channels on the BRI
line individually or simultaneously for
placing or receiving two internal or external
calls on the same or on separate directory
numbers (DNs). In addition to supporting
the BRI bearer services, the following ISDN
supplementary services are supported on the
terminal lines: calling party identification
presentation and restriction (CLIP and CLIR)
and ETSI multiple subscriber number
(MSN).
Call Accounting Supervision
A call accounting supervision station can be designated.
From this station, you can monitor cost recording data
and change whether cost data is recorded for individual
stations.
Caller ID option
A variety of Caller ID functions are available on
incoming and outgoing calls on analog, ISDN, and T1
trunks. Where available from the local central office,
for analog loop- and ground-start trunks, when a display
station receives an incoming call, a message appears
on the display, indicating the source of the incoming
call. This requires a Caller ID interface box. Where
supported by the central office and programmed in the
DIGITAL system, for calls coming in on T1 and ISDN
lines, the telephone number of the incoming caller
appears on the telephone display.
For T1 carriers caller identification is done via the
Automated Number Identification (ANI) protocol. For
ISDN carriers, this is done via the Caller Line
Digital Family Features