Ascotel IntelliGate 2025/2045/2065
76 Networking the Systems Part 1
DDI Direct Dialling In DDI numbers enable internal subscribers to be reached directly
from a public network. In the direct dialling plan the end portion
of a call number is allocated to the number of an internal subscrib-
ers or → PISN subscriber. Several direct dialling plans can be
drawn up for each PBX.
DDO Direct Dialling Out The PBX can forward direct dial numbers to the private leased-line
network via the interface S external.
E.164 – • Numbering plan identifier of the public network as per ITU-T
• Parameter value of parameter → NPI
– Gateway-PINX A PINX is a gateway PINX for the duration of a connection if it
routes that connection from the PISN to the public network or
from the public network to the PISN.
– Node Branch point or end point in a communication network
LCR Least Cost Routing Routing function used to determine the network operators via
which a call is to be routed. Usually the most cost-effective route
(least cost) is selected. LCR is also needed for the overflow from the
private to the public network.
– Dialling by name If a name is stored under a call number, the name can be used for
dialling on the terminal instead of the call number.
– QSIG networking in the IP net-
work
Networking via an existing voice-compatible IP data network
NPI Numbering plan identifier
(Numbering Plan Identifier)
• In the public network, the numbering plan identifier used is
→E.164. In the private area, the numbering plan identifier used
is → PNP
• Configuration parameter used for specifying the numbering plan
identifier. Parameter values: E.164 / PNP / unknown
– Overflow If the chosen line of a→ PINX is not available due to overloading or
due to a defect, the connection pending is set up via an alternative
path determined by the configuration.
PISN Private Integrated Services
Network
Private network based on the ISDN standard in which all the con-
nected subscribers can communicate with one another as internal
subscribers. This applies to both voice traffic and to ISDN-based
data traffic.
– PISN Subscriber • Subscriber in a different → node of a private network
• Category in the internal numbering plan used to replicate the
subscribers in the private network
PINX Private Integrated Services
Network eXchange
→ node of a → PISN, usually a PINX is an ISDN PBX.
PNP Private Numbering Plan • Internal numbering plan of a PBX or PINX
• Service offered by the network provider. Essentially a virtual
counterpart to a PBX numbering plan. Most important compo-
nent of a → virtual PBX.
• Parameter value of parameter → NPI
– Private leased-line network Private network implemented using dedicated lines. In the system
configuration we need to differentiate between the private leased-
line network and the public network.
Abbr. Term Explanation
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