[Freeswitch-users] Invalid and unreliable DTMF

[Steven Ayre]

>
> What i found after enabling mod_spandsp is that it tries to evaluate
> frequencies from entire audio


How else would it detect inband DTMF which could happen at any time during
the call?

If you don't care about DTMF after a certain point you can call
spandsp_stop_dtmf later.


On 23 April 2014 11:46, Manish Kumar <manish.kumar.fs at gmail.com> wrote:

> 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
>> PO BOX 2531
>> Brookfield, WI 53008-2531
>> Twitter: @FreeSWITCH , @briankwest
>> http://www.freeswitchbook.com
>> http://www.freeswitchcookbook.com
>>
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>> iNUM: +883 5100 1420 9001
>> ISN: 410*543
>> Skype:briankwest
>> PGP Key: http://www.bkw.org:81/key.txt (AB93356707C76CED)
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> 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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>> http://www.freeswitchsolutions.com
>>
>> 
>> 
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>
> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
>
> 
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