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List:       asterisk-ss7
Subject:    [asterisk-ss7] echo canceller creates noise with libss7
From:       Jean Cérien <cerien.jean () gmail ! com>
Date:       2016-01-12 19:32:22
Message-ID: CAL_ph0+dQ0O=EGCO8p3WwGuSZruPb9SFRww0gCqeLLtZ3+T77Q () mail ! gmail ! com
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Hello again,

I have a TE235 with hardware echo canceller - drivers look correctly loaded:
lsmod shows:
wcte43x                64019  62
oct612x               170083  1 wcte43x
dahdi                 228088  188 oct612x,wcte43x

I am testing with asterisk 13.6.0, libss7-2.0.0, libpri-1.4.15,
and dahdi-linux-complete-2.11.0+2.11.0

I am running a loopback test, thanks to Gustavo's help, between the two
ports of the TE235. When I activate in chan_dahdi the echo canceller
(echocancel=yes), there is a strong background noise / crackling / audio
garbled on the audio. Sound is crystal clear when I set it no - same issue
if i set it to 128 - though reading the comments of the file, I wasnt
expecting much

However, when I configure dahdi with ISDN mode, and activate echo, or
downgrade to asterisk 11.20.0 & chan_ss7 (trunk), I can activate the echo
canceller and experience no noise at all.

What could be causing this issue ?

Thanks for the help

J.

[Attachment #5 (text/html)]

<div dir="ltr"><br><div>Hello again,  </div><div><br></div><div>I have a TE235 with \
hardware echo canceller - drivers look correctly loaded:</div><div>lsmod \
shows:</div><div><div>wcte43x                        64019   62  </div><div>oct612x   \
170083   1 wcte43x</div><div>dahdi                         228088   188 \
oct612x,wcte43x</div></div><div><br></div><div>I am testing with asterisk 13.6.0, \
libss7-2.0.0,  libpri-1.4.15, and  \
dahdi-linux-complete-2.11.0+2.11.0</div><div><br></div><div>I am running a loopback \
test, thanks to Gustavo&#39;s help, between the two ports of the TE235. When I \
activate in chan_dahdi the echo canceller (echocancel=yes), there is a strong \
background noise / crackling / audio garbled on the audio. Sound is crystal clear \
when I set it no - same issue if i set it to 128 - though reading the comments of the \
file, I wasnt expecting much</div><div><br></div><div>However, when I configure dahdi \
with ISDN mode, and activate echo, or downgrade to asterisk 11.20.0 &amp; chan_ss7 \
(trunk), I can activate the echo canceller and experience no noise at \
all.</div><div><br></div><div>What could be causing this issue \
?</div><div><br></div><div>Thanks for the \
help</div><div><br></div><div>J.</div><div><br></div><div><br></div></div>



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