Call Waiting Defeat Logic - ADEMCO VISTA-128B Installation And Setup Gude

Section 3 – False Alarm Reduction Features

Call Waiting Defeat Logic

Although this option does not directly prevent false alarms, it may prevent the central
station from taking action on a potential false alarm. After the panel's initial call to report
the alarm, the panel may attempt to make an additional call, perhaps for a cancel or a zone
restoral. If Call Waiting is not defeated, an operator at the central station attempting to
contact the premises (to verify whether the alarm is valid) would hear the phone ringing
indefinitely and have to dispatch on the call.
This option, enabled in program field 1*42, attempts to defeat Call Waiting on the first
outgoing call attempt to both the primary and secondary numbers. It does this by dialing a
special sequence preceding the phone number (but after the PABX number). The panel will
dial *70 if using TouchTone and 1170 if using rotary.
The panel does not attempt to defeat Call Waiting on each call attempt, because the phone
company may not complete the call if the sequence is dialed on a phone line that does not have
Call Waiting.
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