Nortel Networks NN43001-106 - Manual (Page 568)

568 Busy Tone Detection for Japan
Busy Tone Detection for Japan requires the Enhanced Extended Universal
Trunk Card for Japan (EXUTJ).
This feature requires a busy tone from the Public Exchange/Central Office.
The system disconnects any call if a busy tone is detected on the incoming
trunk. If called party causes a busy tone to be generated, the call
disconnects whether intended or not. As an example, this may happen if
a Central Office user tries to conference in a busy party. The busy tone is
detected by the circuit switched network trunk and the call disconnects.
If another tone is configured similar to the Busy Tone (frequency + or - 30
Hz and cadence within + or - 100 ms), the busy tone detector is interpreted
as a busy tone and the call is disconnected. Therefore, tones should be
configured so they can be interpreted correctly.
The busy tone detection characteristics are downloaded on a card basis
only. All units on the trunk card must go to the Central Office that produces
the same Busy Tone cadence.
To modify the busy tone detection table assigned to a trunk card, all trunks
on that card must be removed initially from the software (LD 14). It is
recommended that all Central Office loop start trunk units be on the same
card and configured in the same route.
500/2500 Line Disconnect Supervision is supported by this feature.
If the trunk card is not designed to support the Busy Tone Detection (BTD)
feature, BTD can still be configured in the software. However, no feedback
is given to the technician that a discrepancy exists between the software
and hardware configuration.
Feature interactions
Timed Forced Disconnect
Busy Tone Detection for Japan activates a timer to start once a Central
Office (as well as other types of trunks) has been seized. After this timer
expires, the trunk is forced to disconnect. BTD does not impact this timer;
however, whichever timer occurs first will prevail.
Trunk to Trunk Connection
Busy Tone Detection for Japan does not impact the Trunk to Trunk
Connection feature. However, which ever occurs first prevails.
Feature packaging
Busy Tone Detection for Japan is Busy Tone Detection (BTD) package 294.
Nortel Communication Server 1000
Features and Services - Book 1 of 6 (A to B)
NN43001-106 01.04 Standard
Release 5.0 27 July 2007
Copyright © 2007, Nortel Networks
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