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

[Jorge Mendoza]

Gordon Henderson wrote:
> On Sat, 11 Oct 2008, Jorge Mendoza wrote:
>
>   
>> I founded this behaviour in the past. When the CO provides reversal
>> polarity and the FXO port is configured to ignore polarity events, then
>> a reversal polarity could be detected as ringing if the
>> hardware/software is not well designed or configured.
>> So, if the CO provides polarity reversal, why not set answer and release
>> supervision to yes?
>>     
>
> We need the flexability to answer either way...
>
> Here in the UK the (BT) exchange will do a polarity reversal to signal 
> incoming CLI - it then send the CLI, *then* sends the ring signals, so 
> answering on polarity reversal would be wrong.
>   
Answer supervision on reversal polarity applies only to outgoing calls,
not incoming ones.
> They also do a random polarity reversal most nights too - some sort of 
> automated line testing. Eg. from my home box:
>
> Oct  7 01:40:28 NOTICE[15581] chan_zap.c: Got event 17 (Polarity Reversal)...
> Oct  9 03:53:06 NOTICE[19904] chan_zap.c: Got event 17 (Polarity Reversal)...
>
> Note the times...
>   
Are they just warning alarms or they starts phantom calls?

Jorge
> Gordon
>
>   
>> Jorge Mendoza
>>
>>
>> Jim Duda wrote:
>>     
>>> If by default Asterisk ignores all polarity events, then why
>>> does it cause the Dialplan to start?
>>>
>>> I did set answeronplarityswitch to no, however, I have had
>>> the problem occur once already, so, you suspicion might
>>> be correct.
>>>
>>> Jim
>>>
>>> Tzafrir Cohen wrote:
>>>
>>>       
>>>> On Fri, Oct 10, 2008 at 05:51:29PM -0400, Jim Duda wrote:
>>>>
>>>>         
>>>>> Tzafrir,
>>>>>
>>>>> Thanks for the tip.  I'm researching answeronpoliaryswitch.  I suspect
>>>>> this will solve my issue.  I never would have know to look for this.
>>>>>
>>>>> Thanks much!  You made my day :-)
>>>>>
>>>>>           
>>>> Hmm... I might have misled you. By default Asterisk ignores all polarity
>>>> events. Using the polarity events can be a useful feature, but I suspect
>>>> that it is not the cause of your original problem.
>>>>
>>>>
>>>>         
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>
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