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

[Jim Duda]

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.

Thanks,

Jim

[Oct 10 12:47:54] NOTICE[6669]: chan_dahdi.c:7379 mwi_thread: Got event 
17 (Polarity Reversal)...  Passing along to ss_thread
     -- Starting simple switch on 'DAHDI/4-1'
[Oct 10 12:47:55] NOTICE[6671]: chan_dahdi.c:7114 ss_thread: Got event 4 
(Alarm)...
[Oct 10 12:47:55] NOTICE[6671]: chan_dahdi.c:7114 ss_thread: Got event 
17 (Polarity Reversal)...
[Oct 10 12:47:56] NOTICE[6671]: chan_dahdi.c:7114 ss_thread: Got event 5 
(No more alarm)...
     -- Executing [s at incoming:1] Goto("DAHDI/4-1", "incoming-dial,s,1") 
in new stack