Enables or disables detecting the reverse signal for each outside (CO) line’s polarity from the
Central Office when making a call. If enabled, the outside call duration can be determined.
* Outside (CO) line number: 1 through 6 / (All outside lines)
Default All outside (CO) lines – Disable
• Feature Reference
Section 3, Features
Polarity Reverse Detection
System Programming 4-55
4.2 System Programming [424]
[424] Reverse (Polarity) Circuit Assignment