[Asterisk-Users] Ugly echo cancel, with Bristuff/Zaphfc

[James Harper]

I'm using zaptel on a x100p card, so my $0.02 may be apply, but I found
that if I said echocancel=256 (256 taps), I would end up with horribly
distorted outgoing audio (started off okay, but with bad echo, and after
about 20 seconds most of the echo was gone but the audio was almost just
noise).

I went back to 128 and it seemed okay. I haven't tried 64 but you may
have more success with that, or a lower power of two.

Good luck.

James

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of Pisac
> Sent: Sunday, 15 January 2006 14:57
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: [Asterisk-Users] Ugly echo cancel, with Bristuff/Zaphfc
> 
> I'm using bristuffed Asterisk with ISDN/ZAPHFC
> I have VERY ugly (outgoing) sound through ISDN/HFC if echocancel=yes
in
> zapata.conf, but without echocancel I have bad (incoming) echo
> Through PSTN/FXO sound is ok with or without echocancel.
> 
> I tried other echo cancellers (in zconfig.h) two times:
> 
> ECHO_CAN_KB1 (this was default)
> ECHO_CAN_MARK2
> ECHO_CAN_MG2
> 
> after any change I compiled (make clean all && make install) all
drivers
> which are bristuffed, without recompiling Asterisk (should I?), but...
> 
> ... I always have EXACTLY same (ugly) sound and same (appearing of)
echo
> cancelling.
> 
> Seems to me that echo canceller do not changing no matter what I
choose
> in zconfig.h. This must be some bristuff echo cancel "patch" to zaptel
> source? Before I bristuffed Asterisk, I was playing with zconfig.h and
I
> remember that difference between echo canceller were very obvious.
> 
> Anybody have some knowledge about bristuffed echo cancelling?
> 
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