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

[Michael Jerris]

From your explanation, the cirpack is sending the dtmf both 2833 AND inband.  They ARE sending it to you twice, in 2 different methods.  How do you want the other side to get the dtmf?  try pass_2833 param.

Mike

On Aug 27, 2010, at 4:50 AM, Dennis wrote:

> hi all,
> 
> thanks a lot for your support!
> 
> the codec we are using is G711a, so normally using inband should work.
> no transcoding is done. we get G711, fs works with G711 and G711
> leaves our servers.
> although the only short way, we are using voip is a 10 meter long CAT7
> wire connected to a cirpack, we would prefer to use rfc-2833 for
> signaling dtmf inputs.
> 
> the dtmf detector is off.
> 
> we spoke to someone from the cirpack-support and he told us, that they
> do not filter the inband tone, if G711 is used, because we do not need
> rfc-2833 when using G711. if a lower quality codec is used (like
> G729), cirpack will filter the inband tone and send rfc-2833 instead.
> 
> 
> we have the following scenarios:
> 
> 1.) we set dtmf to "info":
> 
> cirpack sends us a clean tone and fs sees one clean tone (both: ||||||||||)
> 
> conclusion: we could drop rfc-2833 and only use inband.
> 
> 
> 2.) we set dtmf to "rfc-2833":
> 
> cirpack send us the tone with a tiny gap (2ms) and rfc-2833 (||
> |||||||||). the guy from cirpack told us, that this is not a real gap,
> but only wireshark sees it as a gap. the gap is where cipack adds the
> requested rfc-2833 information.
> but, fs hears the inband tone as if it were 2 tones and the rfc-2833.
> this worked for us before, because we only reacted on the rfc-2833
> signal.
> now we have to send the audio to another side. on the other side the 2
> inband (one splitted) tones are heard, which leads to problems.
> 
> 
> under the following url you can see a screenshot taken from wireshark.
> the first row is, how cirpack sends the inband and rfc-2833. to last
> row shows, how fs sees the tone.
> https://photos-1.dropbox.com/i/o/uy03PGj0ZEtxIi3r7RV9dBkXXvRoxmJ-KlcBi1i9ovg/3475265/1282986000/8a42bd3
> 
> 
> are there some timing-settings in fs, we could play with to make the
> tiny gap dissaper or something like that, or should we just switch
> completely to inband?
> 
> 
> thanks
> dennis
> 
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