[Freeswitch-users] FreeTDM and DAHDI+OSLEC/MG2 anyone?

[Moises Silva]

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.

Try going to src/ftmod/ftmod_zt/ftmod_zt.c around line 642 and comment the

if (ioctl(ftdmchan->sockfd, codes.ECHOTRAIN, &len)) {
}

the whole if block should be commented, you can use #if 0 #endif, or regular
C comments.

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.

Moises Silva
Senior Software Engineer
Sangoma Technologies Inc. | 50 McIntosh Drive, Suite 120, Markham ON L3R 9T3
Canada
t. 1 905 474 1990 x 128 | e. moy at sangoma.com


On Mon, Jun 28, 2010 at 4:01 PM, Jeroen C. van Gelderen <
jeroeng at thegreek.com> wrote:

> Hi Moises,
>
> Thank you. This is very helpful as it seems to detail the same problem. I
> tested with both OpenZap and FreeTDM yielding the same results.
>
> I think Anthony Minnessale is close when he writes:
>
> "Maybe there are some new ioctls or something
>  they added for interop with OSLEC that we don't
>  know about."
>
> Except that whatever changed in (the) DAHDI (API) seems to have broken all
> echo canceling (MG2 and OSLEC) somewhere between DAHDI and FreeTDM/OpenZap.
>
> Anthony also suggests:
>
> "If you still have the problem the next step
>  would be to add some debugging code to the
>  ozmod_zt read and write functions to see if
>  it's sending data up to the app."
>
> I'm going to see if my C-fu is up to doing that. Anybody know where the
> debugging code should go for FreeTDM?
>
> Lastly, the only semi-relevant Google find I did was this [1]:
>
> "Make sure echotraining is disabled when using
>  Oslec - this is not supported and if enabled
>  will cause the channel to be silent (i.e. no
>  audio will pass through)"
>
> In FreeTDM/OpenZap/FreeSwitch there doesn't seem to be an "echo training"
> knob to twiddle.
>
> Cheers,
> -Slim
>
> [1] http://www.rowetel.com/ucasterisk/oslec.html
>
> --
> Jeroen C. "Slim" van Gelderen
> Olympic Sports Data Services
> Email: jeroeng at thegreek.com
> Phone: +1 876 953 6182 x128
> ________________________________________
> From: freeswitch-users-bounces at lists.freeswitch.org
> [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Moises
> Silva
> Sent: Monday, June 28, 2010 10:04
> To: freeswitch-users at lists.freeswitch.org
> Subject: Re: [Freeswitch-users] FreeTDM and DAHDI+OSLEC/MG2 anyone?
>
> This may be of help:
>
>
> http://lists.freeswitch.org/pipermail/freeswitch-users/2010-March/055505.htm
> l
>
> Moises Silva
> Senior Software Engineer
> Sangoma Technologies Inc. | 50 McIntosh Drive, Suite 120, Markham ON L3R
> 9T3
> Canada
> t. 1 905 474 1990 x 128 | e. moy at sangoma.com
>
> On Sat, Jun 26, 2010 at 8:57 PM, Jeroen C. van Gelderen
> <jeroeng at thegreek.com> wrote:
> Hi everybody,
>
> I have a feeling I must be missing the obvious...
>
> I've been trying to get echo canceling to work with
> Freeswitch/FreeTDM/DAHDI
> but I have been failing miserably for days. When I enable echo cancellation
> (MG2 or OSLEC) on a DAHDI/FreeTDM channel (FXS or FXO) that channel goes
> silent.
>
> In absence of better suggestions I was hoping to replicate someone's "known
> working" configuration. Is anyone successfully running the following
> combination:
>
> - any x86 hardware
> - any recent flavor Linux
> - any recent version of DAHDI using FXO ports
> - FreeSwitch/FreeTDM trunk from git
> - OSLEC echo canceller (or MG2)
> - (BONUS:) Xorcom Astribank with FXO/FXS ports.
>
> I addition to much Googling I've tried most permutations of:
> - CentOS 5.4, 5.5, Ubuntu 10.04 LTS, Elastix
> - x86 and x64 single and multicore CPUs.
> - Non-PAE kernels for 32-bit installs.
> - DADHI from SVN (or -in case of Elastix- the built-in 2.2.0.2)
> - MG2 and OSLEC echo cancellers
> - Freeswitch from Git trunk
>
> In each case everything configures fine to the point that Asterisk 1.6 will
> function with echo cancellation enabled. So we know that DAHDI layer works.
> But Freeswitch channels go silent when echo cancellation is enabled.
>
> Puzzled,
> -Slim
>
> --
> Jeroen C. "Slim" van Gelderen
>
>
>
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