Nortel 1000 Features And Services Fundamentals page 381

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Feature interactions
Autodial Tandem Transfer
Because Autodial Tandem Transfer uses Centrex Switchhook Flash (THF), it
is affected by any modification to the THF enhancement feature.
China - Attendant Monitor
If any set at the customer location involved in the monitored call switchhook
flashes or performs a Centrex switchhook flash, Attendant Monitor is
immediately deactivated.
Collect Call Blocking
A Centrex Switchhook Flash cannot be invoked by another feature while the
Collect Call Blocking answer signal is being sent.
Conference
THF allows conference calls through the CO. It can be invoked only if there
is an established call connected to an outside trunk. If the telephone is
engaged in internal conference calls, THF cannot be used.
Digital Private Signaling System 1 (DPNSS1) Executive Intrusion
If an analog (500/2500 type) telephone is part of an Executive Intrusion
conference, any Switchhook Flash is ignored.
Malicious Call Trace - Enhanced
Interaction with the Centrex switchhook flash results because the flash
range is changed for this feature. Communication to the CO (trunk hook
flash) is performed by using the Centrex switchhook flash feature base
code. The enhanced range is available for the Centrex switchhook flash.
Periodic Clearing on RAN, Meridian Mail, ACD and Music
This feature enhancement is not supported if used together with Centrex
Switchhook flash.
Secrecy
If secrecy is not allowed in LD 15 (OPT = SYD), the attendant must use the
EXCL DEST or EXCL SRC keys to select the Central Office trunk on which
the THF has to be sent. The THF is not activated when both SRC and
DEST are included.
Copyright © 1994–2008, Nortel Networks
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The THF feature can be activated on DTI2 Central Office trunks and
Intelligent Peripheral Equipment (IPE) Central Office trunks.
The Centrex Switchhook timing on the Extended Flexible Universal
Trunk (EXUT) is performed using firmware, offering a significant
improvement in trunk timing accuracy.
Nortel Communication Server 1000
Features and Services Fundamentals — Book 2 of 6 (C)
NN43001-106 02.04 Standard
Release 5.5 9 May 2008
Feature interactions 381