How do I control the line polarity of the Cisco ATA FXS ports when a call is connected or disconnected?
A. You can configure the Polarity bitmap parameter, as mentioned in the Polarity section of Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide, in order to control the line polarity of the Cisco ATA FXS ports when a call is connected or disconnected. Note: If the ATA plays a recorder tone even after the call is disconnected, change the polarity field to 0x0000000c in order to resolve the issue.
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