AT&T System 75 8520T User Manual Page 106

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Listen-In/Talk-Back
D
Using
the Listen-In/Talk-Back Feature
The Security System 8300 has a Listen-In/Talk-Back feature that can be used by
monitoring services that support this feature. Listen-In/Talk-Back is not
allowed for UL-listed installations.
The Listen-In/Talk-Back feature provides three communication modes:
l one-way talk-back mode
l two-way voice mode
l one-way listen-in mode.
By pressing buttons on a touch-tone phone, the monitoring service operator can:
l talk to someone at the premises
l have a two-way conversation with someone at the premises
l listen to talking and other sounds at the premises
l turn off sirens at the premises
l begin another listen-in/talk-back period
l immediately end communication.
Only the monitoring service operator can control the
Listen-ln/Talk-Back
feature and
command the system by pressing buttons on a touch-tone phone connected to the
receiver. A person at the premises cannot control this feature, except to end listen-in/
talk-back by disarming the system.
The following sections describe how the Security System 8300’s Listen-In/Talk-Back
feature works in its different modes and how the feature is controlled by the
monitoring service operator. They also explain how to program the system to enable
the
Listen-ln/Talk-Back
feature, and provide information about how the feature works
with selected monitoring service receivers. Although the four receivers discussed in
these sections have been verified by Underwriter Laboratories as compatible with the
Security System 8300, UL does not allow Listen-In/Talk Back for UL-listed
installations.
AT&T Security System 8300 Installer’s Manual
D-l
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