That is what echo_train_level in zt.conf is used for. I wonder if we should not be calling the echo train ioctl when is 0, may be the sole fact of calling the echo train ioctl is screwing things up.<br><br>Try going to src/ftmod/ftmod_zt/ftmod_zt.c around line 642 and comment the<br>
<br>if (ioctl(ftdmchan->sockfd, codes.ECHOTRAIN, &len)) {<br>}<br><br>the whole if block should be commented, you can use #if 0 #endif, or regular C comments.<br><br>I took a look at the dahdi drivers and it seems even when this setting is 0, then set the state to ECHO_MODE_PRETRAINING, and that can be what OSLEC does not like at all.<br>
<br clear="all">Moises Silva<br>Senior Software Engineer<br>Sangoma Technologies Inc. | 50 McIntosh Drive, Suite 120, Markham ON L3R 9T3 Canada<br>t. 1 905 474 1990 x 128 | e. <a href="mailto:moy@sangoma.com">moy@sangoma.com</a><br>
<br><br><div class="gmail_quote">On Mon, Jun 28, 2010 at 4:01 PM, Jeroen C. van Gelderen <span dir="ltr"><<a href="mailto:jeroeng@thegreek.com">jeroeng@thegreek.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi Moises,<br>
<br>
Thank you. This is very helpful as it seems to detail the same problem. I<br>
tested with both OpenZap and FreeTDM yielding the same results.<br>
<br>
I think Anthony Minnessale is close when he writes:<br>
<br>
"Maybe there are some new ioctls or something<br>
they added for interop with OSLEC that we don't<br>
know about."<br>
<br>
Except that whatever changed in (the) DAHDI (API) seems to have broken all<br>
echo canceling (MG2 and OSLEC) somewhere between DAHDI and FreeTDM/OpenZap.<br>
<br>
Anthony also suggests:<br>
<br>
"If you still have the problem the next step<br>
would be to add some debugging code to the<br>
ozmod_zt read and write functions to see if<br>
it's sending data up to the app."<br>
<br>
I'm going to see if my C-fu is up to doing that. Anybody know where the<br>
debugging code should go for FreeTDM?<br>
<br>
Lastly, the only semi-relevant Google find I did was this [1]:<br>
<br>
"Make sure echotraining is disabled when using<br>
Oslec - this is not supported and if enabled<br>
will cause the channel to be silent (i.e. no<br>
audio will pass through)"<br>
<br>
In FreeTDM/OpenZap/FreeSwitch there doesn't seem to be an "echo training"<br>
knob to twiddle.<br>
<br>
Cheers,<br>
-Slim<br>
<br>
[1] <a href="http://www.rowetel.com/ucasterisk/oslec.html" target="_blank">http://www.rowetel.com/ucasterisk/oslec.html</a><br>
<div class="im"><br>
--<br>
Jeroen C. "Slim" van Gelderen<br>
Olympic Sports Data Services<br>
Email: <a href="mailto:jeroeng@thegreek.com">jeroeng@thegreek.com</a><br>
Phone: +1 876 953 6182 x128<br>
</div>________________________________________<br>
<div class="im">From: <a href="mailto:freeswitch-users-bounces@lists.freeswitch.org">freeswitch-users-bounces@lists.freeswitch.org</a><br>
</div>[mailto:<a href="mailto:freeswitch-users-bounces@lists.freeswitch.org">freeswitch-users-bounces@lists.freeswitch.org</a>] On Behalf Of Moises<br>
Silva<br>
Sent: Monday, June 28, 2010 10:04<br>
<div class="im">To: <a href="mailto:freeswitch-users@lists.freeswitch.org">freeswitch-users@lists.freeswitch.org</a><br>
Subject: Re: [Freeswitch-users] FreeTDM and DAHDI+OSLEC/MG2 anyone?<br>
<br>
</div>This may be of help:<br>
<br>
<a href="http://lists.freeswitch.org/pipermail/freeswitch-users/2010-March/055505.htm" target="_blank">http://lists.freeswitch.org/pipermail/freeswitch-users/2010-March/055505.htm</a><br>
l<br>
<br>
Moises Silva<br>
Senior Software Engineer<br>
Sangoma Technologies Inc. | 50 McIntosh Drive, Suite 120, Markham ON L3R 9T3<br>
Canada<br>
t. 1 905 474 1990 x 128 | e. <a href="mailto:moy@sangoma.com">moy@sangoma.com</a><br>
<div><div></div><div class="h5"><br>
On Sat, Jun 26, 2010 at 8:57 PM, Jeroen C. van Gelderen<br>
<<a href="mailto:jeroeng@thegreek.com">jeroeng@thegreek.com</a>> wrote:<br>
Hi everybody,<br>
<br>
I have a feeling I must be missing the obvious...<br>
<br>
I've been trying to get echo canceling to work with Freeswitch/FreeTDM/DAHDI<br>
but I have been failing miserably for days. When I enable echo cancellation<br>
(MG2 or OSLEC) on a DAHDI/FreeTDM channel (FXS or FXO) that channel goes<br>
silent.<br>
<br>
In absence of better suggestions I was hoping to replicate someone's "known<br>
working" configuration. Is anyone successfully running the following<br>
combination:<br>
<br>
- any x86 hardware<br>
- any recent flavor Linux<br>
- any recent version of DAHDI using FXO ports<br>
- FreeSwitch/FreeTDM trunk from git<br>
- OSLEC echo canceller (or MG2)<br>
- (BONUS:) Xorcom Astribank with FXO/FXS ports.<br>
<br>
I addition to much Googling I've tried most permutations of:<br>
- CentOS 5.4, 5.5, Ubuntu 10.04 LTS, Elastix<br>
- x86 and x64 single and multicore CPUs.<br>
- Non-PAE kernels for 32-bit installs.<br>
- DADHI from SVN (or -in case of Elastix- the built-in 2.2.0.2)<br>
- MG2 and OSLEC echo cancellers<br>
- Freeswitch from Git trunk<br>
<br>
In each case everything configures fine to the point that Asterisk 1.6 will<br>
function with echo cancellation enabled. So we know that DAHDI layer works.<br>
But Freeswitch channels go silent when echo cancellation is enabled.<br>
<br>
Puzzled,<br>
-Slim<br>
<br>
--<br>
Jeroen C. "Slim" van Gelderen<br>
<br>
<br>
<br>
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