[Freeswitch-users] Double-dtmf detection in IVR when a call is routed through FreeSWITCH

[Drew Ozier]

To clarify, I'm not running the IVR. I have a TDM T1 that comes in to an
AudioCodes Mediant 1000 (SIP Gateway) which goes to a FreeSWITCH machine. I
receive calls coming in off the T1 which goes through my Mediant 1000 which
goes to my FreeSWITCH machine which makes an outbound call back through the
Mediant 1000 to an IVR (bridging the inbound and outbound calls). I have
(supposedly) configured the AudioCodes Mediant 1000 to pass the DTMF
in-band, because I want to minimize the amount of modifications I make to
the audio stream going through my system. I also want to be able to log when
DTMF events occur for analysis purposes. If I do not have start_dtmf, then
FreeSWITCH does not show me any DTMF in the logs, but when I have it on, it
will.

Here's a DTMF event in my FreeSWITCH logs:
(I changed the debug message to a notice and added the callId and the nano
time of the event)
2009-05-26 16:02:05 [NOTICE] switch_ivr_async.c:996 inband_dtmf_callback()
348323 61182225861200042042 at 10.1.10.10 DTMF DETECTED: 5
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1322 do_2833() Send start packet
for [5] ts=1217893935 dur=160/160/2000 seq=55199
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send middle packet
for [5] ts=1217893935 dur=320/320/2000 seq=55200
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send middle packet
for [5] ts=1217893935 dur=480/480/2000 seq=55201
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send middle packet
for [5] ts=1217893935 dur=640/640/2000 seq=55202
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send middle packet
for [5] ts=1217893935 dur=800/800/2000 seq=55203
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send middle packet
for [5] ts=1217893935 dur=960/960/2000 seq=55204
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send middle packet
for [5] ts=1217893935 dur=1120/1120/2000 seq=55205
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send middle packet
for [5] ts=1217893935 dur=1280/1280/2000 seq=55206
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send middle packet
for [5] ts=1217893935 dur=1440/1440/2000 seq=55207
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send middle packet
for [5] ts=1217893935 dur=1600/1600/2000 seq=55208
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send middle packet
for [5] ts=1217893935 dur=1760/1760/2000 seq=55209
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send middle packet
for [5] ts=1217893935 dur=1920/1920/2000 seq=55210
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send end packet for
[5] ts=1217893935 dur=2080/2080/2000 seq=55211
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send end packet for
[5] ts=1217893935 dur=2080/2080/2000 seq=55212
2009-05-26 16:02:05 [DEBUG] switch_rtp.c:1258 do_2833() Send end packet for
[5] ts=1217893935 dur=2080/2080/2000 seq=55213

Does the fact that switch_rtp is sending packets mean that FreeSWITCH is
sending out-of-band DTMF as well as recognizing the in-band?

Thanks for your quick replies, hopefully this will make my issue clearer.

-Drew

On Wed, May 27, 2009 at 10:22 AM, Milena <testeador01 at gmail.com> wrote:

> Check the freeswitch log when the dtmf are being received, most likely your
> device is sending them both as Dave says, maybe the telephone you're dialing
> with sends it both inband and rtp. What does the log says?
>
> 2009/5/26 Drew Ozier <drew.ozier at gmail.com>
>
>> I've got a configuration where I receive inbound calls and dial out to a
>> pre-determined 800-number based on the DNIS of the call. I set <action
>> application="start_dtmf"/> and have everything set up so that DTMF only
>> comes to me via inband. When I'm providing DTMF data to the IVR, it will
>> recognize a single keypress as a double-tap. My FreeSWITCH logs only contain
>> one DTMF entry, but when I listen to the receiving end of the call, I can
>> hear a hiccup in the DTMF tone that is getting played. When I do not use
>> 'start_dtmf', this problem goes away. I need inband DTMF detection, but I
>> can't have it messing up the audio stream. Any thoughts?
>>
>> -Drew Ozier
>>
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