[Freeswitch-users] inband DTMF bleeding through

Wed Mar 20 16:12:28 MSK 2013

Hi Michael,

thanks for the response.  The calls terminate via SIP.

I have done some reading and was was looking at the SpanDSP module with the
view to amend the DTMF detection code (bit beyond me at the moment). Does
this sound feasible do you think?

thanks
Matt

On 19 March 2013 16:55, Michael Collins <msc at freeswitch.org> wrote:

> One thing I didn't see in this thread was how the call terminates at your
> FreeSWITCH box. Is it an analog line or a SIP trunk or what?
>
> -MC
>
> On Fri, Mar 15, 2013 at 3:44 AM, Matt Broad <matt at inveroak.com> wrote:
>
>> Hi
>>
>> after speaking to my carrier, they have told me that the tone will always
>> be heard when sent via the PSTN. There is nothing they or BT can do
>> to suppress the tones.
>> Is this something that can be done within Freeswitch? To either remove
>> the tone altogether or to replace it with something else?
>>
>> thanks
>> Matt
>>
>>
>> On 12 March 2013 19:45, Matt Broad <matt at inveroak.com> wrote:
>>
>>> Ok, so the fact that a tone can be heard, although only partially, would
>>> suggest inband digits are being sent too.  I'll speak to my carrier and see
>>> if it is something they can supress their end.
>>> Thanks for the help and the tips on debugging :)
>>>
>>> Thanks
>>> Matt
>>>
>>>
>>> On Tuesday, 12 March 2013, Avi Marcus wrote:
>>>
>>>> To listen to the audio:
>>>> In wireshark, go to telephony -> voip calls -> *wait a second* ->
>>>> click select all -> player -> decode -> check the box for both channels ->
>>>> play, to listen to the actual call.
>>>>
>>>> -Avi
>>>>
>>>> On Tue, Mar 12, 2013 at 5:03 PM, Matt Broad <matt at inveroak.com> wrote:
>>>>
>>>> Hi Avi,
>>>>
>>>> thanks for the tips, wireshark & tcpdump are great!
>>>>
>>>> I have collected the PCAP file after making a call and can see the RTP
>>>> events that show the tones being sent.  How do I now determine if an inband
>>>> tone is also being sent?
>>>>
>>>> thanks
>>>> Matt
>>>>
>>>>
>>>> On 11 March 2013 21:27, Avi Marcus <avi at avimarcus.net> wrote:
>>>>
>>>> Once you get a PCAP, you can open it up in wireshark.
>>>> Then, you can put in the filter: rtpevent.
>>>> That will show you rfc2833 that comes in.
>>>>
>>>> Then you can go to telephone -> voip calls -> *wait a second* -> click
>>>> select all -> player -> decode -> check the box for both channels -> play,
>>>> to listen to the actual call.
>>>>
>>>> -Avi Marcus
>>>> BestFone
>>>>
>>>> On Mon, Mar 11, 2013 at 10:12 PM, Matt Broad <matt at inveroak.com> wrote:
>>>>
>>>> Thanks Steve, thanks nick. Ill take a look at those links :)
>>>>
>>>> Is there anything in particular I should be looking out for to see if
>>>> any inbound is sneaking in?
>>>>
>>>> Again Thanks for the help
>>>> Matt
>>>>
>>>>
>>>> On Monday, 11 March 2013, Nick Vines wrote:
>>>>
>>>> This might also help
>>>>
>>>> General Debugging Freeswitch:
>>>> http://wiki.freeswitch.org/wiki/Debugging_Freeswitch
>>>> Packet Capture: http://wiki.freeswitch.org/wiki/Packet_Capture
>>>>
>>>>
>>>> On Mon, Mar 11, 2013 at 10:03 AM, Steven Ayre <steveayre at gmail.com>wrote:
>>>>
>>>> PCAP is the file format used by packet capturing tools such as tcpdump,
>>>> Wireshark, tshark (Wireshark's command line tool), ngrep and a host of
>>>> others.
>>>>
>>>> -Steve
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On 11 March 2013 15:21, Matt Broad <matt at inveroak.com> wrote:
>>>>
>>>> Hi Avi
>>>>
>>>> thanks for your response.
>>>>
>>>> Sorry I'm quite new to Freeswitch/linux, what is a PCAP?
>>>> I was leaning towards it being the carrier as omitting dropt_dtmf
>>>> results in the full tone being transmitted. My issue is that I cannot see
>>>> how to test is this in fact the case.
>>>>
>>>> Using the dialplan shown in my original emails and setting the log
>>>> level to 7, when making the call I can see the DTMF tones coming in but am
>>>> unsure if this is the inband being reported or the out-of band.
>>>>
>>>> thanks
>>>> Matt
>>>>
>>>>
>>>>
>>>>
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
>>>> consulting at freeswitch.org
>>>> http://www.freeswitchsolutions.com
>>>>
>>>> 
>>>> 
>>>>
>>>> Official FreeSWITCH Sites
>>>>  <http://www.freeswitch.org>
>>>>
>>>>
>>>
>>> --
>>> Thanks
>>> Matt
>>>
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>>
>>
>>
>> --
>> Thanks
>> Matt
>>
>> This email and any attachments to it are confidential and are intended
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>>
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>> Close, Botley, Chesham, Buckinghamshire, HP5 1YA, United Kingdom.
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
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>
>
> --
> Michael S Collins
> Twitter: @mercutioviz
> http://www.FreeSWITCH.org
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> http://www.OSTAG.org
>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
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>
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-- 
Thanks
Matt

This email and any attachments to it are confidential and are intended
solely for the use of the individual to whom it is addressed. Any views or
opinions expressed are solely those of the author and do not necessarily
represent those of InverOak Limited.

If you are not the intended recipient of this email, you must neither take
any action based upon its contents, nor copy or show it to anyone. Please
contact the sender if you believe you have received this email in error.

This email including any attachments cannot be guaranteed to be 100% secure
or error-free as information could be intercepted, corrupted, lost,
destroyed, out-dated, or containing viruses. The sender therefore does not
accept liability for any errors or omissions in the contents of this
message which arise as a result of email transmission.

InverOak Limited is a company registered in England & Wales under company
number 04529594, whose registered address is Old Barn house, 2 Wannions
Close, Botley, Chesham, Buckinghamshire, HP5 1YA, United Kingdom.
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