[asterisk-users] echo cancellation and ztdummy

[Rob Townley]

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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