[asterisk-users] Phantom Rings

[Ed W]

> 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