Specifications

51Digital Family Features
and forwarded, either to the specific person who should
handle the call, or to the first available person from
the group.
You can assign a DID line to one DN at each telephone
(programmed with MSA) so that callers can be given
a direct line to reach the person handling their business,
while other calls can be sent to the same telephone
using the other DNs appearing on it.
Call forwarding of internal or external calls can be
programmed separately for each DN assigned to a
station, or all the DNs can be forwarded to the same
destination.
All of the features described under Call Forwarding
in the User Features, below, can be used with MSA.
In addition, the system can be programmed so that call
forwarding for a DN can be done from any telephone
on which the DN appears.
Music on hold
Outside callers placed on hold can be connected to
external music sources. Up to four different Music On
Hold sources can be connected to the DIGITAL KEY
BX system, up to eight can be connected to the
DIGITAL 400 system, and up to 12 can be connected
to the DIGITAL 1000 system.
North American Numbering Plan
Each system in the DIGITAL family is compatible
with the North American Numbering Plan.
Off-premises extension (OPX) support
Through the SHD - single line extension card, the
DIGITAL systems can connect to other telephone
systems in the same organization, thereby enabling
Direct Dialing from the local DIGITAL systems to
any extension in the remote systems. The SHD interface
can also be used to connect distant SLT extensions
(OPXs) to the system.
Option modules
Three option modules may be attached to each OCD
to provide an internal modem; additional DTMF
receivers; four ImaGEN voice mail ports, or external
page zones and door units (MIM module); Telrads
OAL link; the meet-me-conference option (Source1
module); or to enable the MPD redundancy feature in
DIGITAL 1000 systems (Source 2 module).
Page interface (external)
Up to eight external page or public address systems
may be connected to the DIGITAL KEY BX and
DIGITAL 400 systems, and up to 24 external page or
public address systems may be connected to the
DIGITAL 1000 system.
PC attendant (option)
A detailed description of the PC attendant is provided,
above, in Section 2, Terminal Units, under both
Attendant and PC attendant and PC attendant features.
Preferred connection
A station may be programmed to receive a pre-defined
trunk or trunk group immediately when going offhook.
This feature facilitates "Behind CENTREX"
applications.
PRI (ISDN Primary Rate Interface)
The DIGITAL system supports ISDN Primary Rate
Interface outside lines and PRI ISDN supplementary
services such as Call-By-Call Integrated Service Access,
Caller Line Presentation (CLIP), Caller Line Restriction
(CLIR), and Direct Inward Dialing (DID), where
supported by the public network. The ETSI (Euro-
ISDN), AT&T-4 ESS, AT&T-5ESS or NT1-DMS100
standards for Primary Rate Interfaces may be used,
depending on public network support. The ISDN Pri-
mary Rate Interface can also be used to connect
DIGITAL systems in a network. See ISDN Features,
below.