Specifications

56 Digital Family Features
ISDN FEATURES
The main DIGITAL systems' ISDN features are
described below.
Call-By-Call Integrated Service Access
On a call-by-call basis, based on the number dialed,
the system, after connecting to an ISDN channel, can
request PRI ISDN services such as Outward Wide Area
Telephone Service (OUTWATS), foreign exchange
(FX), or tie lines from the public network. With call-
by-call integrated service access, you have a great
amount of flexibility. For each call, any ISDN channel
can provide you with any of the services supported by
the public switch. Therefore, you do not need the
expense and trouble of a dedicated line for each service
that you want to use.
Caller Line Identification Presentation (CLIP)
The Avanti telephones with displays show the number
of the calling party if the call is received over an ISDN
line and the calling party has not blocked the display
of the number. On outgoing calls on ISDN lines, your
number can be displayed to the called party (if they
have a caller identification facility). If your DIGITAL
system is programmed to restrict caller line
identification, you can override this restriction on a
call-by-call basis, by entering a feature code. Also see
the related feature Calling Line Identification
Restriction, below.
Caller Line Identification Restriction (CLIR)
On outgoing calls on ISDN lines, you can prevent the
display of your number to the called party. If your
DIGITAL system is programmed to present caller line
identification, you can block this presentation on a call-
by-call basis, by entering a feature code. Also see the
related feature Calling Line Identification Presentation,
above.
Direct Inward Dialing (DID)
The DIGITAL systems have the ability to translate
dialed digits coming in on an ISDN line. They support
Direct Inward Dialing from an exchange via ISDN
lines. This enables outside callers, using the advantages
of ISDN, to dial directly to a particular extension in
the DIGITAL system without the intervention of an
attendant.
Equal access
Where AT&T or Nortel ISDN standards are supported
by the public network, the DIGITAL system will
provide equal access for BRI outside lines and terminals.
Multiple subscriber numbers
Where ETSI ISDN is supported by the public network,
BRI station lines can be assigned multiple subscriber
numbers for identifying the terminal for call charging
and caller ID purposes.
Video conferencing
Video conferences via ISDN lines can be established
with an appropriately configured personal computer,
receiving or calling out using two B channels of the
BRS card.
PRIVATE NETWORK FEATURES
The main DIGITAL systems' private networking
features are described below.
Alternate routing
Networked DIGITAL systems provide alternate routes
for internal and external calls to make the best use of
all available tie, ISDN, DPNSS, QSIG, T1/E1, DID,
and outside lines connected to the network.
Calls to destinations within the network can be routed
along various tie routes throughout the branches of the
private network or, if the tie lines are not available,
along ISDN, DPNSS, QSIG, T1/E1, DID, or exchange
outside lines. Calls to outside numbers are routed along