User`s guide

35(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
Proprietary service - Rerouting
Definition
The CN rerouting feature offers the possibility for an
ASB 150 02 system to reroute external calls preferably
to one of three possible centralised answer positions
located in another CN PBX in the private network.
The reason for CN rerouting can be that the CN PBX
of one‘s own, is in night switched mode and/or does
not have any position to serve rerouted calls (e.g. the
PBX is too small to have a dedicated operator of its
own).
The centralised answer position can be:
• any extension in another CN PBX
• a COP in an ASB 150 02 system
• a COP in an ASB 501 system
Use
The CN rerouting functionality is applicable for all
ASB 150 02 systems in the network, independent of
whether they act as:
• gateway CN PBX
• transit CN PBX
• terminating CN PBX
Operation
Routing principle
The external incoming trunk re-directs a call in
accordance with its reroute conditions (no reply, busy,
not available, vacant, etc..) and referenced central
answer position(s). The information about the involved
parties - calling, called and rerouted- to-party identities
is carried in the network during the whole CN
rerouting event between the concerned CN PBXs.
Not the terminating CN PBX but ASB 150 02 systems
acting as a gateway will always take care of CN
rerouting, in order to archive the best possible route.
For calls originated within the private network no
rerouting will ever be performed so that it will not
interfere with other CN features e.g. Call-Back. This
rule is independent of the command 2084 ( describing
whether CN calls shall be treated as internal or
external calls ).
CN rerouting attempts to the three possible centralised
answer positions take place according to a defined
priority.
1 Local reroute position day,
acc. to command 1103.
2 1st CN reroute choice
according to command 1110.
3 2nd CN reroute choice
according to command 1111.
4 3rd CN reroute choice
according to command 1112.
5 Local reroute position night,
according to command 1104.
The criteria for selection is relying on the day/night
switched status of each choice.
An ASB 501 COP PBX informs, the whole network
periodically about its day/night switched status (central
operator present/absent). According to the received
status of the COP, the ASB 150 02 system marks the
CN reroute choice refering to the notifying COP as
valid or invalid choice. Once marked invalid, the next
CN reroute choice according to the priority will
automatically be chosen.
The day/night status notification functionality is neither
supported by an ASB 150 02 COP system nor by any
other system offering a centralised answer position.
The ASB 150 02 systems in the whole network will
therefore mark these kinds of CN reroute choices
always as valid.
Capacity
Up to three CN reroute positions can be defined per
system.
Limitation
Only one performed CN rerouting is permitted per call
in order to avoid possible ‘call loops’.
The programmed central answer position must be
defined by a complete unique private network number
if located in another CN PBX.