[asterisk-users] Got event 17 (Polarity Reversal)...

Fri Oct 10 12:34:48 CDT 2008

On Fri, Oct 10, 2008 at 12:57:27PM -0400, Jim Duda wrote:
> Can anyone tell me what this message means?
> 
> Got event 17 (Polarity Reversal)...
> 
> I'm running DAHDI 2.0 with a TDM401 card.  Asterisk version 1.6.0.
> 
> It appears that I get this Polarity Reversal each time an inbound call 
> hangs up. This results in another ring, but no one is there.  It appears 
> as an unknown caller, but I believe its a phantom.

  grep polarity /etc/asteirsk/chan_dahdi.conf

See the documentation for answeronpolarityswitch and
hanguponpolarityswitch .

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               Tzafrir Cohen
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