User`s guide

14(59)
Datum/Date Rev
Dokumentnr/DocumentnrUppgjord/Prepared
Dokansv/Godkänd - Doc respons/Approved Kontr/Checked Tillhör/Referens-File/Reference
99-07-15 A
365/155 34-ASB 150 02 Uen
FACILITY DESCRIPTION
Faktaansvarig - Subject responsible
System feature - Location code
Within a “Location” (Arear) one or more PBXs may be
grouped together in order to be identified by the
Location code consisting of up to 4 digits. This number
is used in a corporate network to define the PBX, or a
group of PBXs to which the call should be routed.
System feature - Node Identity
Within a corporate network every PBX is identified by
the Node Identity consisting of up to 4 digits. This
number is used in a corporate network to define the
PBX to which the call should be routed.
The node-ID is implicitely given with the definition of
routes in the other connected nodes.
In a mixed number plan consisting of several locations
(groups of PBXs) each PBX in the corporate network
may be reached by dialling the Location Code and the
Node Identity of the desired PBX. If the location only
consists of one PBX, this PBX will not have a node-ID.
System feature - Private Network Routing
Defintion
In ASB 150 02 without Digital Private Networking two
types of external call routing are available:
• basic routing
• least cost routing.
Basic routing gives access to defined trunk(s), but
makes alternative routing by a simple prefixing to the
called number (via tie line) also possible.
Least cost routing (LCR) makes a more enhanced
analysis of the route (carrier) choice and, if necessary,
carries out a number conversion of the destination
number. Cross reference tables enable the destination
number conversion between different types of network
choices.
Both routing features do not meet the requirements
and are not suitable for the structure of private network
routing.
For private network calls the Private Network Router
(PNR) will be initiated as soon as the internal number
analysis gives a private access number.
The PNR is intended to be a routing mechanism of its
own, which has the following main tasks:
Routing based on dialled number
According to the dialled number a destination number
conversion based on the chosen route will be
performed
VPN functionality
VPN functionality with full number conversion of private
network directory numbers to public numbers
( conversions up to max. 16-digit public directory
numbers.)
Alternative routing
The PNR offers 4 route choices for each private
network directory number, with the first one having the
highest and the fourth one the lowest priority.
Route selection principle
The 4 route choices are always available in case of
internaly originated calls, as well as non-proprietary
transit calls. All route choices will be checked
according to their priority and if all route choices fail
due to one of the special causes described below, the
call will be released and the originator will receive
congestion. When there is a programmed trunk reroute
position, the transit calls will be rerouted according to
the conditions in the transit node, otherwise the transit
node sends congestion to the preceding PBX, and this
exchange may perform alternative routing according to
its capabilities.
In case of proprietary transit calls the number of
available route choices can be restricted. This
restriction makes it possible to exclude unintentional
routes ( e.g. public connections ) and to force the
preceding PBX to perform a more cost effective
alternative routing ( e.g. by selecting a leased line ).
Internal calls via LCR will only use the first route
choice. If this route choice cannot be accessed due to
one of the special causes described below, the LCR
function selects the next carrier according to the LCR
analysis.