Nortel 1000 Features And Services Fundamentals page 415

China - Busy Tone Detection
Contents
This section contains information on the following topics:
"Feature description" (page 415)
"Operating parameters" (page 415)
"Feature interactions" (page 416)
"Feature packaging" (page 416)
"Feature implementation" (page 416)
"Feature operation" (page 418)
Feature description
In many countries, loop start trunks are not supervised. Therefore, many
Public Exchanges/Central Offices send a busy tone to the system when the
external party has disconnected. A tone detector must be used to detect
this tone.
The China - Busy Tone Detection (BTD) feature allows a technician to
enter the characteristics of the busy tone to be detected in overlay 97.
This information is downloaded to the system trunk for use during call
processing. Once the busy tone is detected, the trunk sends a message
to the system software, which then disconnects the call, and the trunk
is free for other uses.
An option is provided to allow Busy Tone Disconnect to occur only for
incoming calls. This option is also programmed in LD 97. Cadence
information is downloaded on a card basis.
Operating parameters
The Busy Tone Detection functionality is implemented on the Enhanced
Extended Universal Trunk Card for China (NTRA10AA).
Copyright © 1994–2008, Nortel Networks
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Nortel Communication Server 1000
Features and Services Fundamentals — Book 2 of 6 (C)
NN43001-106 02.04 Standard
Release 5.5 9 May 2008
415