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

[Eric "ManxPower" Wieling]

Then none of this applies.

Bill Gibbs wrote:
> Ok, in my case it would be my Cisco 3660 since that's what talks to the
> PRI.  It talks sip to my Asterisk box.
> 
> Thanks!
> 
> 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 9:34 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] One way "screech" or tone
> 
> 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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