Hi Are echo cancellation parameters useful when using the ztdummy driver and no physical card ? Thanks Patrick
On 4/23/07, Patrick Fortin <gestion@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.
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@gmail.com> wrote:> On 4/23/07, Patrick Fortin <gestion@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. > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
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@gmail.com> wrote: >> On 4/23/07, Patrick Fortin <gestion@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. >> _______________________________________________ >> --Bandwidth and Colocation provided by Easynews.com -- >> >> asterisk-users mailing list >> To UNSUBSCRIBE or update options visit: >> http://lists.digium.com/mailman/listinfo/asterisk-users >> > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users