ASCOM Ascotel 2025 System Manual page 80

Networking Technology Terminology
Before the basics of private networking are explained, the table below defines the
key terminology for networking technology:
Tab. 1.4: Networking technology terminology
Abbr. Term
– Exchange
– Break-in
– Break-out
CTX Centrex
DSS1 Digital Subscriber Signalling 1 Signalling protocol for ISDN networks (also called Euro-ISDN)
DDI Direct Dialling In
DDO Direct Dialling Out
E.164 –
– Gateway PINX
Node
LCR Least Cost Routing
– Dialling by name
NoIP Networking over Internet
Protocol
NPI Numbering plan identifier
(Numbering Plan Identifier)
HBT_20321104_01/B0_en
ascom
Explanation
Short for ® public network
An external incoming ® DDI connection for a PISN subscriber is
routed into the ® PISN at the ® PINX that is closest to the caller.
An outgoing external connection is routed into the public ISDN
only at the PINX that is closest to the call destination.
The designation Centrex, for Central Office Exchange Service, is a
product name which some network providers use for the services
provided by the
® virtual PBX.
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.
The PBX can forward direct dial numbers to the private leased-line
network via the interface S external.
• Numbering plan identifier of the public network as per ITU-T
• Parameter value of parameter ® NPI
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.
Branch point or end point in a communication network
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.
If a name is stored under a call number, the name can be used for
dialling on the terminal instead of the call number.
Networking via an existing voice-compatible IP data network
• 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
Ascotel 2025/2045/2065
Networking the Systems 1.25