[asterisk-dev] bug in echo cancel at 256 taps

[Eric "ManxPower" Wieling]

Sounds like ECFO.

Echo Canceler Freak Out, this happens when the rxgain is too high and 
the echo canceler freaks out.  Some users describe it as "screeching", 
"feedback", "static", or other useless terms.  If users report "static" 
on a system where there cannot be static (all digital, PRI, SIP, etc), 
you might be experiencing ECFO.

John Lange wrote:
> Yesterday and this morning we experienced a serious bug in the echo
> cancellation.
> 
> While trying to tweak out some echo on a new asterisk install we set
> echocancel=256. From then on, calls would usually start out ok (but
> still with some echo) then there would be what users describe as a
> 'click' followed by a huge blast of echo making the call impossible to
> continue.
> 
> At that point it seems as though the echo is actually being inserted
> into the call rather than removed.
> 
> asterisk-1.2.10
> libpri-1.2.3
> zaptel-1.2.7 with default ECHO_CAN_KB1
> 
> Card is a Sangoma A101 using wanpipe-beta7-2.3.4.tgz .
> 
> Just wanted to run it by the list before entering a bug report to make
> sure its appropriate and that this isn't actually a wanpipe bug.
> 
> Is there any other sort of other debugging or analysis that would be
> helpful?
> 
> Regards,
> 
> John
> 
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