[Freeswitch-users] inband DTMF detection and drop

[Piotr Gregor]

http://dataandsignal.com/frequency-detection/#dtmf_remover



Piotr Gregor
Software Engineer

M: (+44) 07483 866 525     L: (+44) 01256 597 470     www: dataandsignal.com






On Sun, May 24, 2020 at 2:26 PM Avi Marcus <avi at avimarcus.net> wrote:

> Do you hear a lot of dtmf, or just a tiny bleep? It can take a little bit
> of time to clamp down...
>
> I use something a bit different, setting these three variables:
>
> <action application="set" data="rtp_manual_rtp_bugs=FLUSH_JB_ON_DTMF "/>
> <action application="set" data="jitterbuffer_msec=60"/>
> <action application="set" data="sip_jitter_buffer_during_bridge=true"/>
>
> jitterbuffer of 60ms (3x ptime of 20 packets) means it can squelch it back
> to the beginning. This however means it could add a delay of 60ms.
> And keep the jitter buffer even while we're bridging.
>
>
> -Avi Marcus
> Bestfone
>
>
>
> On Tue, May 19, 2020 at 12:33 AM SamyGo <govoiper at gmail.com> wrote:
>
>> Hi all,
>> I've followed all the previous suggestions to detect the inband DTMF
>> coming from a provider and to drop them from going further into B leg.
>> However the inband DTMF still goes to otherside and user can hear clicking
>> sounds. Here's what I've  done so far:
>>
>> *VERSION:*
>> FreeSWITCH Version 1.10.2-release+git~20191231T140119Z~f7bdd3845a~64bit
>> (git f7bdd38 2019-12-31 14:01:19Z 64bit)
>>
>> *OS:* Ubuntu 18.04.4 LTS
>>
>> *DIALPLAN:*
>> <extension name="dtmf_filter">
>>             <condition field="${acl(${network_addr} lan)}"
>> expression="true"/>
>>             <condition field="destination_number" expression="(.*)">
>>                         <action application="set"
>> data="rtp_manual_rtp_bugs=FLUSH_JB_ON_DTMF|ignore_dtmf_duration"/>
>>                         <action application="set"
>> data="jitterbuffer_msec=1p"/>
>>                         <action application="set"
>> data="spandsp_dtmf_rx_filter_dialtone=true"/>
>>                         <action application="set"
>> data="dtmf_verbose=true"/>
>>                         <action application="set" data="drop_dtmf=true"/>
>>                         <action application="spandsp_start_dtmf"/>
>>                         <action application="bridge"
>> data="{bridge_filter_dtmf=true,drop_dtmf=true}sofia/gateway/CISCO_GW/$1"/>
>>             </condition>
>>     </extension>
>>
>>
>> I've also tried suggestion by other users on mailing list related to
>> flush JB on DTMF rtp_bug but that doesnt help either.
>>
>>
>> *CONSOLE OUTPUT:*2020-05-12 23:59:10.195999 [DEBUG]
>> mod_spandsp_fax.c:295 FLOW DTMF Potentially '5' - total -15.55dB, row
>> -32.25dB, col -40.30dB, duration 338436 - miss
>> 2020-05-12 23:59:10.195999 [DEBUG] mod_spandsp_fax.c:295 FLOW DTMF
>> Potentially '5' - total -17.99dB, row -30.58dB, col -40.99dB, duration
>> 338538 - miss
>>
>> It does detect the number but its not a hit.
>>
>> Can I get some more ideas how to drop inband DTMF tones, Thanks.
>>
>> Best Regards,
>> Sammy
>>
>> _________________________________________________________________________
>>
>> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
>> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
>> services.
>> Build your next product on our scalable cloud platform.
>>
>> Join our online community to chat in real time
>> https://signalwire.community
>>
>> Professional FreeSWITCH Services
>> sales at freeswitch.com
>> https://freeswitch.com
>>
>> Official FreeSWITCH Sites
>> https://freeswitch.com/oss
>> https://freeswitch.org/confluence
>> https://cluecon.com
>>
>> FreeSWITCH-users mailing list
>> FreeSWITCH-users at lists.freeswitch.org
>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> https://freeswitch.com
>
> _________________________________________________________________________
>
> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> services.
> Build your next product on our scalable cloud platform.
>
> Join our online community to chat in real time
> https://signalwire.community
>
> Professional FreeSWITCH Services
> sales at freeswitch.com
> https://freeswitch.com
>
> Official FreeSWITCH Sites
> https://freeswitch.com/oss
> https://freeswitch.org/confluence
> https://cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> https://freeswitch.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20200527/891f69fd/attachment-0001.html>