Re: echo cancellation and ztdummy

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echo cancellation and ztdummy
\ Patrick Fortin (23 Apr 2007)
. \ William Moore (23 Apr 2007)
. . \ Rob Townley (24 Apr 2007)
. . . \ Jorge Mendoza (24 Apr 2007)

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Subject:	Re: echo cancellation and ztdummy
Group:	Asterisk-users
From:	Jorge Mendoza
Date:	24 Apr 2007

http://www.voip-info.org/wiki/view/Causes+of+Echo

Rob Townley wrote:
> Please tell me what "hybrid echo" is? Where does it come from? Does
> it have something to do with analog vs T1 trunk lines?
>
> On 4/23/07, William Moore <nyphbl8d> wrote:
>> On 4/23/07, Patrick Fortin <gestion> wrote:
>> > Are echo cancellation parameters useful when using the ztdummy
>> driver and
>> > no physical card ?
>>
>> No. The echocan software and hardware only cancel hybrid echo. They
>> do not cancel acoustic echo that would be generated by voip phones
>> with bad speakerphones or bad headsets.
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