[asterisk-users] Phantom Rings

[Jon Pounder]

Quoting Ed W <lists at wildgooses.com>:


one thing I thought about, but never actually did was to install a  
damping circuit across the line - a phone plugged in the line never  
actually rang or if it did it was so short it was imperceptible. I  
figured just a load across the might damp down the test pulse enough  
to not be tricked into ringing the channel bank.

social engineering rather than technical engineering eventually solved  
the problem though.



>
>> I'm fairly certain the problem is with the phone line.  I have all
>> callerID settings disabled as the Telco is unable to provide it along
>> with our rollover line setup due to limitations in their antiquated
>> switch.  The CLI and Logs all plainly show the calls as if they were
>> normal calls with the exception of a message about "Failed to write
>> frame" and no DTMF attempts, then the call is routed into the operator
>> queue.  The calls always came in on Zap1-1 so I tried swapping the 2
>> lines to see if it stayed on port 1 or if the phantom followed the
>> line.  As expected, the phantom rings followed the line and began
>> showing up on Zap2-1.  So it pretty has to be something in the telco,
>> but I'm not sure what.  Putting "WaitForRing(3) before the "Answer"
>> command in my IVR menu eliminates most of them, but sometimes more of
>> them slip through.
>>
>
>
> I get a similar problem with a domestic analogue line in the UK.  I
> *speculate* that there is a short half ring being sent for some reason
> (line test or similar), but my card (Digium) seems to need about 5
> seconds to detect hangup on the remote end, so I get a phantom 2 rings
> at my end and then it stops...
>
> No solution, but thought it might give you something to consider...
>
> Ed W
>
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Jon Pounder

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