MS48IP Programming Guide
80
Polarity Reversal:
Activates the Polarity Reversal detection for lines where the C.O. provides Polarity
Reversal facility. Through polarity reversal detection on the lines:
a) The exact duration of the outgoing call can be calculated.
b) If an external caller, calling the system through a DISA or ACD line hangs
up the telephone before the call is answered by an extension, the line is
automatically dropped.
c) If one of the parties hang up the telephone in Line-Line Connection,
External Call Diversion or Remote Line Access features, the two lines are
automatically dropped.
d) If an external party hangs up the telephone, while her/his call has been
parked on the system, the line is dropped.
8 0 2 2 2 D P
Parameters
D
:
The line access code
P
:
0
The system cannot detect Polarity Reversal on D.
:
1
The system can detect Polarity Reversal on D.
Default Value
P=0.
Notes
1. When P = 1, the system does not record the calls established through the lines
where the Polarity Reversal is not detected.
2. If the C.O. is providing
Polarity Reversal
facility and if parameter P = 1, the
system uses
Polarity Reversal
to calculate the duration of the outgoing external
calls in the following way:
-
The polarity is reversed by the C.O. when the external party lifts his
handset and this reversal is noted as the starting time of the call.
-
The time when the extension hangs up is noted as the ending time of the
call.
Thus,
Call duration = Ending time of the call - Starting time of the call
