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1.5 Making Call Features
Feature Guide 77
1.5.4.5 Reverse Circuit
Description
The circuit in the PBX can detect the reverse signal from the telephone company when an
extension user is trying to make a trunk call. This detects the start (a called party goes off-
hook) and end (the called party goes on-hook) of an outgoing trunk call. When an trunk call is
received, the circuit can also detect the reverse signal after an outside caller goes on-hook.
The duration of call can be verified on SMDR using this feature ( 1.25.1 Station Message
Detail Recording (SMDR)).
It is possible to select whether the PBX detects the reverse signal for outgoing trunk calls only,
or for both outgoing and incoming trunk calls, or for no trunk call (disable the detection) through
system programming ( LCOT Reverse Circuit [415]).