416 China - Busy Tone Detection
The system will disconnect any call once busy tone is detected on the
incoming side of the trunk. If the user on the far end causes busy tone to
be generated by any means, the call is disconnected whether or not that
was the intention.
The BTD characteristics are downloaded on a card basis only (not on a unit
basis) and thus all units on the trunk card must go to Public Exchanges that
produce the same busy tone cadence.
Busy Tone Detection may not work with conference bridges in certain
situations. This is due to the nature of conference bridges in such that all of
the trunks are incoming. In the situation where two or more loop start trunks
with BTD disconnect simultaneously, the resulting busy tone from each
trunk may be detected by the BTD inhibitors of the other trunks. The result
would be a stalemate where all trunks remain connected.
If a trunk card is not designed to support the Busy Tone Detection feature
(for example, for future BTD hardware implementation), the functionality
can still be configured in software.
To change Busy Tone Detection assigned to a trunk card, all trunks on the
card must first be removed using LD 14.
Feature interactions

Loop Start Supervisory Trunks

The interaction with Intelligent Peripheral Equipment (IPE) trunks occurs
because Busy Tone Supervision (BTS) can be configured in conjunction
with any existing supervision type. For the EXUT, BTS can now be
configured with a supervision type of BST (both incoming and outgoing
battery reversal) and Polarity Insensitive (PIP). These supervision type’s
call processing methods are not changed, except that now the first type of
supervision received is the one acted upon.
Feature packaging
China - Busy Tone Detection requires Busy Tone Detection (BTD) package
294, which depends upon Intelligent Peripheral Equipment (XPE) package
203.
Feature implementation
Task summary list
The following is a summary of the tasks in this section:
•"LD 97 - Busy Tone table configuration." (page 417)
Busy Tone table configuration.
Nortel Communication Server 1000
Features and Services Fundamentals — Book 2 of 6 (C)
NN43001-106 02.04 Standard
Release 5.5 9 May 2008
Copyright © 1994–2008, Nortel Networks
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