[Freeswitch-users] Invalid and unreliable DTMF

[Manish Kumar]

Hi Brian,

Thanks for your reply,

We are only using *Sangoma cards without echo cancellation*, so we are
already using our systems with hardware dtmf detection as disabled  (
TDMV_HW_DTMF = NO).

Instead we tried on spare *Sangoma card with echo cancellation* and
hardware detection enabled ( TDMV_HW_DTMF = YES) and found no issues.
However if i go with this solution then it would need me to replace more
than 100 cards. :(

Using mod_spandsp with the below dialplan example results in more wierd
results, i just pressed key 5 and received 4,5 and 8 DTMF on console. *Please
suggest if DTMF detection has any more configuration inside
spandsp.conf.xml.*

<extension name="park_for_dtmf">
    <condition field="destination_number" expression="park_for_dtmf">
        <action application="set" data="dtmf_verbose=true"/>
        <action application="spandsp_start_dtmf" />
        <action application="park"/>
    </condition>
 </extension>

What i found after enabling mod_spandsp is that it tries to evaluate
frequencies from entire audio. which in my case can be resource intensive
as we do lakhs of calls per day and have 32E1s on single machine.







On Wed, Apr 23, 2014 at 12:57 AM, Brian West <brian at freeswitch.org> wrote:

> Disable the hardware dtmf detector and use the SpanDSP one.
> --
> Brian West
> brian at freeswitch.org
> FreeSWITCH Solutions, LLC
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> On Apr 22, 2014, at 8:50 AM, Manish Kumar <manish.kumar.fs at gmail.com>
> wrote:
>
> > Hi,
> >
> > I am facing an issue where DTMF digits are wrongly captured or getting
> entirely missed from being detected.
> >
> > Environment:
> > Sangoma A116 / A108
> > Freeswitch Version 1.2.14
> > mod_freetdm
> > perl ivr scripts using perl ESL
> > PRI lines from Indian operator.
> >
> > However the same script and same configuration works perfectly well on
> Freeswitch version 1.0.7. Also none of the versions gave any issue when i
> test by simply using mod_sofia and an extension on x-lite.
> >
> > I viewed the entire change logs from version 1.0.7 till 1.2.14, there
> are no changes on DTMF since 1.0.7
> >
> > Are there any possibilities that telco plays a role as well in such DTMF
> issues.?
> >
> >
> > Thanks,
>
>
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