4-56 System Programming
[424] 4.2 System Programming
Enables or disables detecting the reverse signal for each exchange line’s polarity from the
Local Exchange when making a call. If enabled, the outside call duration can be
determined.
*Exchange line number: 1 through 6 / (All exchange lines)
Default All exchange lines – Disable
• Feature Reference
Section 3, Features
Polarity Reverse Detection

[424] Reverse (Polarity) Circuit Assignment

4
2
4
NEXT
SELECT
END
exchange line no.*
(Enable/
Disable)
(1
···
6/ )
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