I meant what I said ;-) The test case is the local end hearing the remote party's voice echoing, which I'm simulating by playing back a recorded file with echo at the remote end.
Since you're saying there is no such thing as a SIP echocan and by extension, I presume that the echocan on an FXO gateway won't cancel echo generated at the remote end either -- only echo caused by the local twisted pair where the FXO gateway is. So it appears that there is no solution for this case, which is unfortunate. On Mon, Apr 20, 2009 at 4:02 PM, John Lange <[email protected]> wrote: > On Mon, 2009-04-20 at 14:28 -0400, Simon P. Ditner wrote: >> If I have the following setup: >> Hanset--Asterisk Local--FXO gateway--Analog--PSTN--Asterisk Remote >> (audio source with echo) >> >> And I purposely make Asterisk Remote send audio over the channel with >> echo to Asterisk Local, is there anything Asterisk Local can do to >> cancel the echo, or is that system out of luck? > > The FXO Gateway has to do the echo cancel. Otherwise you are out of > luck. There is no such thing as a SIP echo canceller and in any case the > latency would make it very difficult. > >> and whether there is anything that can be done when you are >> hearing the remote party's voice echoing, > > The remote party's voice echoing? Did you mean to say; your own voice > echoed back from the remote side? Or the remote side is hearing their > own voice echoed? > > Just trying to clarify which side is hearing the echo. > > -- > John Lange > http://www.johnlange.ca > > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
