Dear Jacob, Any chance to give us any timing approximation for a next version? Regards, Anton. On 28 April 2006 17:26, Jacob Tinning wrote: > On Tue, 18 Apr 2006, leonimar cape wrote: > > Can someone give a suggestion on what I should do to > > omit the echo. Here is may scenario > > > > --- h323 --- chan-ss7 --- > > A---| |--------| |--------------| |----B > > --- --- --- > > Nextone Asterisk DMS > > The next version of chan_ss7 will include > enabling/disabling of the zaptel echo-canceller, which > probably will solve your problem. > > > The calling party can hear every words he/she say > > after 1 to 2 seconds. But the called party can hear A > > with no echo and the quality is clear. I have already > > tried it in both digium (TE410P) and sangoma card > > (AT104) and the results where the same. Is there any > > way that I can cancel the echo? Any particular > > settings that I have to change in the settings of the > > asterisk? > > The current version of chan_ss7 does not do anything to > avoid echo. It just passes the audio through the > channels. > > The problem is when A calls an old analog phone B. Old > analog phones typically bleed some of the audio back to > the sender. > > Ordinary synchronous telephone-networks doesn't delay the > audio very much ( < 10ms) so the caller will not notice > any echo. > > Unfortunately, ip-networks induce more delay ( > 70 ms ) > which will clearly sound as echo. > > To avoid the echo, the only (as far as I know) solution > is to insert some kind of echo-canceller "in" or "to the > right" of Asterisk in your drawing. > > As noted above, the next version of chan_ss7 will start > the zaptel echo-cancellation when a new call is made > (this is configurable, if you don't want > echo-cancellation), and stop it again when the call is > finished. > > Mvh. Jacob
|