[asterisk-users] One way "screech" or tone

[Eric "ManxPower" Wieling]

IP Phone <-> Asterisk <-> PSTN.

This would be the Echo Canceler on the Asterisk/Zap <-> PSTN interface.

Bill Gibbs wrote:
> So would this be the remote end echo can freaking out or the Polycom on
> the caller side?
> 
> Bill
> 
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Eric
> "ManxPower" Wieling
> Sent: Wednesday, July 26, 2006 9:02 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] One way "screech" or tone
> 
> Bill Gibbs wrote:
> 
>> Randomly, and this is very hard to debug because it happens so quickly
>> on outbound calls I get a one way screech, it's a steady tone that's
>> very loud.  The remote end cannot hear it.  You can hear the person
>> talking through the tone.  I can't describe it but it's bad enough you
>> have to hang up and call back, and everything then is of course fine
>> since it's so random I have not been able to reproduce it on demand.
> 
> jbot: 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.
> 


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