[Asterisk-Users] Zap Polarity Reversal

[Rich Adamson]

> > Previously I would get two events on my Zap channel which indicated
> > ringing and answered.  Now I am getting polarity reversal events:
> >
> > Nov  2 07:01:25 NOTICE[18246]: chan_zap.c:6014 ss_thread: Got event 17
> > (Polarity Reversal)...
> > Nov  2 07:01:28 NOTICE[18246]: chan_zap.c:6014 ss_thread: Got event 17
> > (Polarity Reversal)...
> >
> > I am using CVS Head from:
> >
> > Asterisk CVS HEAD built by root at asterisk.hulber.com on a i686 running
> > Linux on 2005-11-02 05:13:32 UTC
> > _______________________________________________
> 
> Sounds like a new feature.  Have you tried reversing the polarity or putting
> a butt set that indicates pol on the line?  I don't know that it makes a
> difference but you might as well correct it if it is reversed.

That actually sounds more like whatever telco he's connecting to is
providing answer supervision in the form of polarity reversal. Without
knowing more about which country / telco, there is no way to tell.
Note the polarity reversal is happening _after_ asterisk gets a call,
therefore not likely to have anything to do with reversed tip/ring.

That same message does not occur in the US with the analog TDM card, so
not sure what the OP has or is connected to.