Specifications

57Digital Family Features
the most efficient and economical route. For example,
calls may be routed via the private network to the
branch closest to the destination or routed directly to
the public exchange, whichever is more practical.
Back-to-back operation
To double the system capacity, two DIGITAL systems
can be connected by customer-owned tie lines. With
back-to-back operation, all of the outside lines in both
systems are available to any of the extensions in either
system.
Call back on busy
When an extension is busy, the DIGITAL system
automatically calls back the sender of a message left
at your extension, even if the sender is in another
DIGITAL system that is connected to your system via
a network.
Call back no answer
When there is no answer at an extension, the DIGITAL
system automatically calls back the sender of a message
left at your extension, even if the sender is in another
DIGITAL system that is connected to your system via
a network.
Central ImaGEN
One ImaGEN system can support ImaGEN features
for any extension in networked DIGITAL systems.
With DPNSS, ImaGEN can also support voice mail
features to networked switches of other vendors (see
DPNSS networking, below).
Conferencing
All networked systems may participate in a regular or
meet-me conference, with up to eight parties in each
DIGITAL system participating. The parties in each
system can be local extensions, outside lines, or
networked extensions.
DPNSS networking
With DPNSS, you can build a network of DIGITAL
systems or establish a network between one or more
DIGITAL systems and other switches. With DPNSS
you have improved network-wide services, even
between switches of different vendors. The DIGITAL
KEY BX, DIGITAL 400, and DIGITAL 1000 systems
support DPNSS basic call features including hold,
transfer, conference, and interworking for basic call
services, as well as, the following DPNSS
supplementary features:
Call forward (call diversion)
Callback on busy
Callback no answer
Caller Line Presentation (CLIP)
Indefinite loop avoidance
In addition, the following proprietary services
are accepted on a DPNSS network:
Message
Page
Centralized voice mail - message LED
Centralized voice mail - voice memo
Centralized voice mail - voice mail screens
Centralized voice mail - call forward to mailbox
Centralized voice mail - message retrieval from
mailbox
Centralized voice mail - call record
Conference add-on
Transit capability
Trunk optimization
Some of these DPNSS features have been customized
for the DIGITAL system.
External call forward
Calls may be forwarded to a telephone external to your
DIGITAL system. See Call forwarding and External
call forward under User Features, below.