1.5 Making Call Features
Feature Guide 45
1.5.2.5 Reverse Circuit
Description
The PBX can detect the reverse signal sent from the telephone company when an extension user tries to
make an outside (CO) line call. This detects the start (the called party goes off-hook) and end (the called
party goes on-hook) of an outgoing outside (CO) line call. The duration of the call can be verified with SMDR
using this feature ( 1.20.1 Station Message Detail Recording (SMDR)).
This feature is also known as Polarity Reverse Detection.
Conditions
• If Reverse Signal Detection is enabled for an outside (CO) line ( Polarity Reverse Detection [424]),
the PBX will automatically start the timer ( Call Duration Counter Start [204]) immediately after the
outside party answers the call.
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