[Freeswitch-users] Serious and urgent problem with DTMF! Please help...

Michael Collins msc at freeswitch.org
Mon Aug 16 12:27:12 PDT 2010


On Mon, Aug 16, 2010 at 5:56 AM, Dennis <odermann at googlemail.com> wrote:

> phillip, it seems that we have somehow the same problem, but we have
> an additional strange behavior.
>
> we used wireshark on the incoming network-card and on the outgoing
> side. there we see two strange things, we can not figure out:
>
> 1.) on the incoming side, we receive the in-band tone from the cirpack
> with a tiny gap, but fs recognizes them as 2 tones.
> in wireshark it look something like this: | ||||||||
> as i said, fs sees this as two tones.
>
> 2.) fs sends the tone above to the outgoing side as two tones, but
> seems to cut the first ms of the second part.
> in wireshark it looks something like this: |      |||
>
>
> i feel, that we have to find out the following:
>
> 1.) why does the tone already have a gap, when we receive it?
>
That would probably be better answered by looking at the sending side. I
would capture the packets leaving the sending side to see what they look
like.


>
> 2.) why does fs not leave the tone untouched? something happens with
> the tone, while passing fs. is there a setting to avoid this?


> 3.) why is there no easy way to completely delete dtmf tones, if it is
> possible with vuvuzela-noise? ;-)
>
I'll defer to those more knowledgeable than I on these other two
questions...
-MC
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