[Freeswitch-users] How do you determine if DTMFs received are in-band or out-of-band?

Mark Melling mark.melling at savageminds.com
Fri Jul 7 19:17:19 UTC 2017 

Yes, I mean that the caller who is pressing the buttons (although in this
case the button presses are automated as they are included at the end of
the original dial string).

The reason why I believe this is possible is that in a different set-up,
not using Freeswitch (rather using Twilio) we were successfully able to
transmit DTMFs (as part of dial string) and they were not audible to the
caller.

I'm just wondering as I type this, if the fact that they were part of the
dial string is significant?



On Fri, 7 Jul 2017 at 20:05 Guillermo Ruiz Camauer <grcamauer at gmail.com>
wrote:

> Do you mead that the user ON THE OTHER END doesn't hear anything?  Because
> I believe most devices will generate their own audible tone on the
> generating end.
>
> On Fri, Jul 7, 2017 at 3:42 PM, Mark Melling <mark.melling at savageminds.com
> > wrote:
>
>> Thanks for that, that is useful info.
>>
>> I posted a separate, but related question that you might have some
>> suggestions about.
>>
>> Namely I'm assuming that for RFC-2833 DTMFs Freeswitch is generating a
>> corresponding tone for the received DTMF (I don't know if this is actually
>> true or not).  If this is the case whether it is possible to disable this
>> tone so that basically a user pressing a key (that generates a DTMF)
>> doesn't hear anything.
>>
>> Thanks
>>
>>
>> On Fri, 7 Jul 2017 at 19:22 Guillermo Ruiz Camauer <grcamauer at gmail.com>
>> wrote:
>>
>>> RFC-2833 sends the DTMF as a special packet within the RTP stream.
>>> SIP-INFO sends it in the SIP dialog.
>>> INBAND DTMF come as a series of packets within the RTP stream that must
>>> be analyzed to find the frequencies corresponding to the different DTMF.  I
>>> believe spandsp takes cares of this.
>>>
>>> Guillermo
>>>
>>> On Fri, Jul 7, 2017 at 1:14 PM, Mark Melling <
>>> mark.melling at savageminds.com> wrote:
>>>
>>>> Thanks Brian.
>>>>
>>>>
>>>> On Fri, 7 Jul 2017 at 16:51 Brian : <brians at iptel.co> wrote:
>>>>
>>>>> I believe thats 2833
>>>>>
>>>>> From the source:
>>>>>
>>>>> switch(dtmf->source) {
>>>>>
>>>>>                         case SWITCH_DTMF_INBAND_AUDIO:  /* From audio
>>>>> */
>>>>>
>>>>>                                 dtmf_source_str = "INBAND_AUDIO";
>>>>>
>>>>>                                 break;
>>>>>
>>>>>                         case SWITCH_DTMF_RTP:                   /*
>>>>> From RTP as a telephone event */
>>>>>
>>>>>                                 dtmf_source_str = "RTP";
>>>>>
>>>>>                                 break;
>>>>>
>>>>>                         case SWITCH_DTMF_ENDPOINT:              /*
>>>>> From endpoint signaling */
>>>>>
>>>>>                                 dtmf_source_str = "ENDPOINT";
>>>>>
>>>>>                                 break;
>>>>>
>>>>>                         case SWITCH_DTMF_APP:                   /*
>>>>> Injected by application */
>>>>>
>>>>>                                 dtmf_source_str = "APP";
>>>>>
>>>>>                                 break;
>>>>>
>>>>>                         case SWITCH_DTMF_UNKNOWN:               /*
>>>>> Unknown source */
>>>>>
>>>>>                         default:
>>>>>
>>>>>                                 dtmf_source_str = "UNKNOWN";
>>>>>
>>>>>                                 break;
>>>>>
>>>>> On Fri, Jul 7, 2017 at 4:28 PM, Mark Melling
>>>>> <mark.melling at savageminds.com> wrote:
>>>>> > Thanks Brian,
>>>>> >
>>>>> > Having done that it says
>>>>> >
>>>>> > DTMF-Source: RTP
>>>>> >
>>>>> > So I assume that means that the DTMF is in-band, is that right?
>>>>> >
>>>>> >
>>>>> >
>>>>> > On Fri, 7 Jul 2017 at 16:19 Brian : <brians at iptel.co> wrote:
>>>>> >>
>>>>> >> Hi Mark
>>>>> >>
>>>>> >> From fs_cli
>>>>> >>
>>>>> >> /event plain dtmf
>>>>> >>
>>>>> >> This will give you console logging of every DTMF event that FS
>>>>> handles
>>>>> >> and I'm pretty sure will give you the DTMF source.
>>>>> >>
>>>>> >>
>>>>> >>
>>>>> >> On Fri, Jul 7, 2017 at 10:44 AM, Mark Melling
>>>>> >> <mark.melling at savageminds.com> wrote:
>>>>> >> > Hi,
>>>>> >> >
>>>>> >> > How can you determine if Freeswitch is receiving DTMFs in-band or
>>>>> >> > out-of-band?
>>>>> >> >
>>>>> >> > I'm not entirely clear on terminology here, but is out-of-band
>>>>> the same
>>>>> >> > as
>>>>> >> > rfc 2833?
>>>>> >> >
>>>>> >> > Thanks
>>>>> >> >
>>>>> >> > Mark
>>>>> >> >
>>>>> >> >
>>>>> >> >
>>>>> >> >
>>>>> _________________________________________________________________________
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>>>>> >> > http://www.freeswitchsolutions.com
>>>>> >> >
>>>>> >> > Official FreeSWITCH Sites
>>>>> >> > http://www.freeswitch.org
>>>>> >> > http://confluence.freeswitch.org
>>>>> >> > http://www.cluecon.com
>>>>> >> >
>>>>> >> > FreeSWITCH-users mailing list
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>>>>> >>
>>>>> >>
>>>>> _________________________________________________________________________
>>>>> >> Professional FreeSWITCH Consulting Services:
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>>>>> >> http://www.freeswitchsolutions.com
>>>>> >>
>>>>> >> Official FreeSWITCH Sites
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>>>>> >> http://www.cluecon.com
>>>>> >>
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>>>>> >
>>>>> >
>>>>> >
>>>>> _________________________________________________________________________
>>>>> > Professional FreeSWITCH Consulting Services:
>>>>> > consulting at freeswitch.org
>>>>> > http://www.freeswitchsolutions.com
>>>>> >
>>>>> > Official FreeSWITCH Sites
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>>>>> > http://www.cluecon.com
>>>>> >
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>>>>>
>>>>>
>>>>> _________________________________________________________________________
>>>>> Professional FreeSWITCH Consulting Services:
>>>>> consulting at freeswitch.org
>>>>> http://www.freeswitchsolutions.com
>>>>>
>>>>> Official FreeSWITCH Sites
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>>>>> http://www.cluecon.com
>>>>>
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>>>>
>>>>
>>>>
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
>>>> consulting at freeswitch.org
>>>> http://www.freeswitchsolutions.com
>>>>
>>>> Official FreeSWITCH Sites
>>>> http://www.freeswitch.org
>>>> http://confluence.freeswitch.org
>>>> http://www.cluecon.com
>>>>
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>>>> http://www.freeswitch.org
>>>>
>>>
>>>
>>>
>>> --
>>> Guillermo Ruiz Camauer
>>> _________________________________________________________________________
>>> Professional FreeSWITCH Consulting Services:
>>> consulting at freeswitch.org
>>> http://www.freeswitchsolutions.com
>>>
>>> Official FreeSWITCH Sites
>>> http://www.freeswitch.org
>>> http://confluence.freeswitch.org
>>> http://www.cluecon.com
>>>
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>>
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
>> http://confluence.freeswitch.org
>> http://www.cluecon.com
>>
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>> http://www.freeswitch.org
>>
>
>
>
> --
> Guillermo Ruiz Camauer
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
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