[asterisk-users] echo cancellation and ztdummy

[Jorge Mendoza]

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 at gmail.com> wrote:
>> On 4/23/07, Patrick Fortin <gestion at royaume.com> 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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