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

[Dan Peters]

Hi Jim,

We had this exact problem with our system for several years.  A call
would come in with no caller ID and when we answered nobody would be
there.  On the Asterisk console would be the "Got event 17 (Polarity
Reversal)" message.

We spent hours and hours on this.  Our carrier was AT&T (SBC).  I spoke
with their tech support several times and spoke with many phone guys.
Nobody could solve it.

We moved our office to a new location and are now using Comcast VOIP
lines into the TDM card and the problem is gone now.  It had to be
something with the POTS lines we were getting from AT&T.  Another
interesting thing is that we didn't get the calls all the time but when
we did get them they were ALWAYS on the hour or half-hour.

Thanks, Dan

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Jim Duda
Sent: Friday, October 10, 2008 11:57 AM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] Got event 17 (Polarity Reversal)...

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


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