[Freeswitch-users] freeswitch, openzap, dahdi issues...

Anthony Minessale anthony.minessale at gmail.com
Fri Mar 19 10:42:33 PDT 2010

Look at it this way.

The PRI signaling is a data channel, it's got nothing to do with echo
cancelers.  The echo can is for the audio legs.
The OSLEC is a kernel module and dahdi is Digiums driver also a kernel
module. OpenZAP only opens these devices and uses them as advertised.

Keep in mind, When we added support for digium cards it was when there was
still zaptel and every day they change things in their code which is mostly
kernel space and they have absolutely no interest in having it work on
FreeSWITCH, even though we are both open source applications they treat
FreeSWITCH like a threat.

You are trying to escape from asterisk but you are still using mostly their

So bottom line changing around which pri stack you use is not going to solve
audio problems.
All OpenZAP does with digium cards is open the device and read and write
from it.
If you are getting no audio the problem is happening in the kernel before
OpenZAP gets to see anything.

My suggestion is to look at /usr/local/freeswitch/conf/zt.conf
there is a line
echo_cancel_level => 64

try erasing or commenting it out with a leading ;

>From my recollection when you use OSLEC, you have to disable the
dahdi/zaptel echo canceler.

This is the only setting I can think of that allows OpenZAP to influence the
dahdi kernel mod.

BTW, you got that card for $100 because it really is worth that much, maybe
less ;)

Everyone who uses Sangoma cards with OpenZAP have no audio problems at all.

On Fri, Mar 19, 2010 at 9:49 AM, <Russell.Mosemann at cune.org> wrote:

> Moises Silva <moises.silva at gmail.com> said:
> >
> > On Thu, Mar 18, 2010 at 8:48 PM, Russell Mosemann
> <Russell.Mosemann at cune.org
> > > wrote:
> >
> > >
> > > Sorry, I'm looking for a solution, myself. The echo over the T1 isn't
> all
> > > that bad here, but it would be nice to use EC.
> > >
> > >
> > You can always get a Sangoma board with HWEC :-)
> I'd love to, believe me. In the past, we had four Sangoma data T1 boards
> and load balanced our connection to the Internet over them. The hardware
> was solid, setup was pretty easy and I got quick answers from support. It
> was great.
> Unfortunately, there is absolutely no money for the current project. We
> had to scrounge a throwaway server and buy a cheap PRI T1 card off of
> Ebay. We happened to acquire an additional T1 license on our Siemens
> telephone switch as part of another project, and we bought a used T1 card
> for the telephone switch off of Ebay. We've only spent about $100 on
> something that could easily cost $10,000. We're hoping that after we get
> a proof of concept going, the right people will see the value and fund a
> better solution. We'll keep you mind. ;-)
> --
> Russell Mosemann
> ________________________________________________________
> Concordia University, Nebraska
> See http://www.cune.edu/ for the latest news and events!
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Anthony Minessale II

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