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NEAX2400 ICS ISDN PRI Installation Notes
The PBX supports User to Network protocol; however, provision has been made for the
PBX to be configured as a network for test purposes. In applications where two PBXs are
connected via private lines, one PBX may be configured as a network (however, NEC does
not guaranty this type of operation).
2.3 ISDN PRI Services
ISDN PRI offers a number of features and services. It is important to know the type of
services the customer has ordered with the ISDN PRI at the time of installation. This
information will help you to configure the PBX correctly.
The services may be provided by the carrier through Servicing Provisioning (or Fix) or as
Call-by-Call (CBC) Service Selection. Servicing Provisioning is a type of service dedicated
to specific ISDN interfaces or channels. CBC is a service where channels are not dedicated
to a specific service and are, therefore, not channel dependent.
CBC is also distinguished by its use of the Network Specific Facility (NSF). The NSF uses
various information elements in the setup message for each given call and allows for the
identification of the type of service requested when a call is placed. In the case of CBC, the
NSF needs to be sent by the PBX to the network with each call. The ACBC command is
used for setting CBC. This command also allows you to program the type of numbering plan
(examples include national, international, or private; type of network (AT&T or NT); and
type of service or feature). When the NSF is not sent when requested or is not recognized by
the network, the call will be rejected. The customer should provide information regarding
the types of subscribed services. In the case of Local CO where the services subscribed to
are DOD and DID on a same ISDN interface without the NSF, the programming of the NSF
is unnecessary.
The ACBC command is also used to indicate to the network the long distance carrier
selection code. An example of this would be when the ISDN is provided by the local carrier
and long distance is provided by AT&T, MCI, or Sprint. This is called Transmit Network
Selection (TNS).
The number provided by the user to the network or PBX is the Calling Party Number (CPN).
The CPN is programmed with ACNP and ACND commands. These commands add the area
code number and office code numbers to the extension number from where the call
originated. If multiple CPNs are required, the AANDE command should be used; this
command will allow the assignment of one CPN per individual tenant. The AANDE
command will override the ACNP and ACND commands. The CPN can be privacy optioned
with the feature class of service using the ASFC SFI 94. The privacy option service notifies
the network and called party to restrict the presentation of the CPN. If SFI 94 was set to 1,
the network will deliver the CPN to the called user with “Presentation Restricted” in the
indicator field. It is the responsibility of the user to restrict the CPN when the CPN and the
“Presentation Restricted” message are received at the same time.
The ISDN network can deliver two types of caller ID - Billing Number (BN) or Calling
Party Number (CPN). Two additional SFIs - 97 and 98 - are used to indicate which caller ID
is preferred to be received from the network.
