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

[Guillermo Ruiz Camauer]

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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>> >
>> > ____________________________________________________________
>> _____________
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>> >
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>> > http://www.cluecon.com
>> >
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>>
>> _________________________________________________________________________
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>> http://www.freeswitchsolutions.com
>>
>> Official FreeSWITCH Sites
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>>
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>
>
> _________________________________________________________________________
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>
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>
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-- 
Guillermo Ruiz Camauer
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