[Asterisk-Users] Zap Polarity Reversal

[Rich Adamson]

Its not an issue, but a notice. Since I don't see it here with a TDM card,
I can only guess that its one of two things:
 - your telco line is providing tip/ring reversal for answer supervision, or,
 - your tip/ring connection to the pstn in reversed.

Since the chipset on the TDM fxo module automatically handles tip/ring
connections in either direction, best guess is that its the first item.

You can verify that by placing a regular voltmeter on the tip/ring pair
and watching it while placing a call.

------------------------

> I am in the US, NYC using a TDM400 card.  I never have never seen this 
> issue until now.  I see some code has been changed in this area recently.
> 
> MARK.
> 
> Rich Adamson wrote:
> >>> 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.
> >
> >
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