NEC XN120 Feature Manual page 116

Features
Line Reversal - Analogue Trunks
n Description
Line reversal is supplied by the network provider to indicate when the called party has answered. It is
therefore only available for outgoing calls made from the Aspire system.
Line reversal is only available for analogue trunks connected to COIU PCB's.
When the line reversal is detected by the Aspire the call timer (at the system phone with a display) will
start.
The call duration of the SMDR will also start when the line reversal is detected, this gives an accurate
indication of call durations.
Without line reversal the call timer and SMDR call duration will start after a timer (Program
21-01-03).
Conditions
Line reversal must also be supplied by the network provider.
Default Setting
Polarity reverse and timeout.
n Programming
14-02-08 : Answering Condition - Select polarity reverse only or polarity reverse and timeout
21-01-03 : Trunk Inter digit timer - Set the timeout duration
Features Manual
114