[asterisk-ss7] asterisk oh323 - chan-ss7 echo problem

[Goke Aruna]

Can someone suggest any other h323 protocol that could
use with asterisk instead of oh323?

I had similar problem with oh323 and each time it happens the asterisk will
stop at a call going above 30 simultaneus calls

However, I read from voip-info and which give oh323 some ratings to oh323.

I used A104D sangoma card with chan_ss7 and no echo.

goksie

On 4/28/06, Anton <anton.vazir at gmail.com> wrote:
>
> 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
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