[Freeswitch-users] how to Ignore DTMF shorter than Fixed duration ?

Fri Dec 7 18:25:28 MSK 2012

For the reasons RFC2833 Olle already mentioned, on a bridge FS *must* forward
the RFC2833 onto the other leg before it has received the end packet. If FS
waited for the end packet before deciding to forward the RTP then you'd get
a 1200ms+ lag on audio.

On 7 December 2012 12:59, Regis M <regis.freeswitch.org at tornad.net> wrote:

> Thanks.
> But does FS start replaying it on other leg at the end or while it receive
> info.
> I had begin to reduce impact by binding digit action, but It seems the
> problem is still here.
>
> I know if i need dtmf or not in some calls, so, any other way to ignore
> ALL dtmf ? :)
> Regards
>
>
> 2012/12/7 Olle E. Johansson <oej at edvina.net>
>
>
>> 6 dec 2012 kl. 22:52 skrev Michael Collins <msc at freeswitch.org>:
>>
>> Bummer. I'm not aware of any way to ignore those. Anyone else have ideas?
>>
>>
>> The problem with ignoring DTMF in RTP is that it will delay audio,
>> always. Let's say you want to delete all DTMF shorter than 1200 ms.
>> We receive a DTMF begin packet, then will have to wait to 1220 ms to see
>> if the DTMF CONTINUE packets continue or if we actually get a DTMF END
>> packet arriving in time. If it does, we'll delete the DTMF - but that
>> will produce a gap in the audio we will have to fill. If it is longer
>> than 1200 ms we will start playing it out on the other side of the call
>> bridge.
>>
>> You seriously do not want to delay audio 1200 ms. Not even 100 ms.
>>
>> There no simple solution to this. We've had issues with GENBAND servers
>> and their DSPs that send short DTMF in calls with
>> female voices.
>>
>> In short. When we receive the start of the DTMF we have no idea about the
>> duration. We can't make a decision until it's too late to make a
>> decision... If you just focus on delaying DTMF, you will start playing DTMF
>> on top of audio, cancelling out parts of the conversation.
>>
>> /O
>>
>> -MC
>>
>> On Thu, Dec 6, 2012 at 12:59 AM, Regis M <regis.freeswitch.org at tornad.net
>> > wrote:
>>
>>> Hi,
>>>
>>> It's RFC2833 DTMF, not inband.
>>>
>>> Regards,
>>>
>>>
>>> 2012/12/5 Michael Collins <msc at freeswitch.org>
>>>
>>>> Are they sending those digits inband or with RFC2833?
>>>> -MC
>>>>
>>>> On Wed, Dec 5, 2012 at 11:28 AM, Regis M <
>>>> regis.freeswitch.org at tornad.net> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> We have a bugged provider that send us throw RTP wrong DTMF during
>>>>> call. It seems that wrong DTMF are shorter than 1200ms (about 90%) so I
>>>>> want to try to ignore them.
>>>>> For the moment, FS catch them and send it back to the bridged side,
>>>>> boring user.
>>>>>
>>>>> switch_rtp.c:3410 RTP RECV DTMF C:552
>>>>>
>>>>>
>>>>>
>>>>> Does min-dtmf-duration will make FS ignore them and not RECV them ?
>>>>> I saw the DTMF in "normal" RTP packet, but no digit was pressed in
>>>>> user side.
>>>>>
>>>>> It's commented in my FS switch.conf.xml, how can I see the current
>>>>> value ?
>>>>> <!--<param name="min-dtmf-duration" value="400"/>-->
>>>>>
>>>>>
>>>>> Any other idea ?
>>>>>
>>>>> thanks
>>>>>
>>>>> _________________________________________________________________________
>>>>> Professional FreeSWITCH Consulting Services:
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>>>>> http://www.freeswitchsolutions.com
>>>>>
>>>>> 
>>>>> 
>>>>>
>>>>> Official FreeSWITCH Sites
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>>>>>
>>>>
>>>>
>>>> --
>>>> Michael S Collins
>>>> Twitter: @mercutioviz
>>>> http://www.FreeSWITCH.org <http://www.freeswitch.org/>
>>>> http://www.ClueCon.com <http://www.cluecon.com/>
>>>> http://www.OSTAG.org <http://www.ostag.org/>
>>>>
>>>>
>>>>
>>>>
>>>> _________________________________________________________________________
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>>>> http://www.freeswitchsolutions.com
>>>>
>>>> 
>>>> 
>>>>
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>>>
>>> _________________________________________________________________________
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>>>
>>> 
>>> 
>>>
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>>
>>
>> --
>> Michael S Collins
>> Twitter: @mercutioviz
>> http://www.FreeSWITCH.org <http://www.freeswitch.org/>
>> http://www.ClueCon.com <http://www.cluecon.com/>
>> http://www.OSTAG.org <http://www.ostag.org/>
>>
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
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>>
>> _________________________________________________________________________
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>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
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>
> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
>
> 
> 
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