[Freeswitch-users] spandsp_start_dtmf detects # key many times

[Michael Jerris]

If you are using a sip phone, you are MUCH better off using non audio based dtmf like rfc-2833.  If you are already using this, its possible that what is happening is the phone is sending the dtmf as audio and 2833, at which point, you should not have to use spandsp_start_dtmf at all.  If the phone is sending only audio, and is not capable of using any other method, you will need to pull a pcap of this call, use wireshark to extract the audio, and do some analysis of the audio to figure out why it is detecting multiple digits.


> On Jan 19, 2015, at 4:38 AM, Nagalenoj H. <nagalenoj at gmail.com> wrote:
> 
> Hi,
> 
> When I use spandsp_start_dtmf along with play_and_get_digits, '#' is getting detected many times, though it is pressed once.
> 
> Other DTMFs are getting detected properly, whereas the '#' is getting detected 2 or 3 times. 
> 
> I have checked the SIP phone's settings, I do not find anything wrong there.
> 
> What could be the reason? Is this because of some SIP phone setting? Here is the freeswitch log,
> 
> 2015-01-19 09:33:39.671681 [DEBUG] mod_spandsp_dsp.c:373 DTMF BEGIN DETECTED: [1]
> 2015-01-19 09:33:39.671681 [DEBUG] switch_channel.c:488 RECV DTMF 1:2000
> 2015-01-19 09:33:39.851686 [DEBUG] mod_spandsp_dsp.c:385 DTMF END DETECTED: [1], duration = 191 ms
> 2015-01-19 09:33:40.071688 [DEBUG] mod_spandsp_dsp.c:373 DTMF BEGIN DETECTED: [4]
> 2015-01-19 09:33:40.071688 [DEBUG] switch_channel.c:488 RECV DTMF 4:2000
> 2015-01-19 09:33:40.251687 [DEBUG] mod_spandsp_dsp.c:385 DTMF END DETECTED: [4], duration = 153 ms
> 2015-01-19 09:33:40.431699 [DEBUG] mod_spandsp_dsp.c:373 DTMF BEGIN DETECTED: [7]
> 2015-01-19 09:33:40.431699 [DEBUG] switch_channel.c:488 RECV DTMF 7:2000
> 2015-01-19 09:33:40.631680 [DEBUG] mod_spandsp_dsp.c:385 DTMF END DETECTED: [7], duration = 204 ms
> 2015-01-19 09:33:40.851688 [DEBUG] mod_spandsp_dsp.c:373 DTMF BEGIN DETECTED: [4]
> 2015-01-19 09:33:40.851688 [DEBUG] switch_channel.c:488 RECV DTMF 4:2000
> 2015-01-19 09:33:40.971695 [DEBUG] mod_spandsp_dsp.c:385 DTMF END DETECTED: [4], duration = 127 ms
> 2015-01-19 09:33:41.151691 [DEBUG] switch_core_session.c:1053 Send signal sofia/internal/sip:278 at 192.168.2.86:5060 <http://sip:278@192.168.2.86:5060/> [BREAK]
> 2015-01-19 09:33:41.171701 [DEBUG] mod_spandsp_dsp.c:373 DTMF BEGIN DETECTED: [7]
> 2015-01-19 09:33:41.171701 [DEBUG] switch_channel.c:488 RECV DTMF 7:2000
> 2015-01-19 09:33:41.351680 [DEBUG] mod_spandsp_dsp.c:385 DTMF END DETECTED: [7], duration = 191 ms
> 2015-01-19 09:33:41.371686 [DEBUG] switch_ivr_play_say.c:1314 Codec Activated L16 at 8000hz 1 channels 20ms
> 2015-01-19 09:33:41.691686 [DEBUG] mod_spandsp_dsp.c:373 DTMF BEGIN DETECTED: [#]
> 2015-01-19 09:33:41.691686 [DEBUG] switch_channel.c:488 RECV DTMF #:2000
> EXECUTE sofia/internal/392 at 3427.vbiz.mundio.com <mailto:392 at 3427.vbiz.mundio.com> flush_dtmf()
> 2015-01-19 09:33:41.691686 [DEBUG] switch_ivr_play_say.c:1314 Codec Activated L16 at 8000hz 1 channels 30ms
> 2015-01-19 09:33:41.711684 [DEBUG] mod_spandsp_dsp.c:385 DTMF END DETECTED: [#], duration = 38 ms
> 2015-01-19 09:33:41.771683 [DEBUG] mod_spandsp_dsp.c:373 DTMF BEGIN DETECTED: [#]
> 2015-01-19 09:33:41.771683 [DEBUG] switch_channel.c:488 RECV DTMF #:2000
> 2015-01-19 09:33:41.771683 [DEBUG] switch_ivr_play_say.c:1747 done playing file file_string:///root/united_fone/voice_files/en//CR_enter_conf_pin.wav
> 2015-01-19 09:33:41.771683 [DEBUG] switch_ivr_play_say.c:1314 Codec Activated L16 at 8000hz 1 channels 30ms
> 2015-01-19 09:33:41.811686 [DEBUG] mod_spandsp_dsp.c:385 DTMF END DETECTED: [#], duration = 25 ms
> 2015-01-19 09:33:41.871691 [DEBUG] mod_spandsp_dsp.c:373 DTMF BEGIN DETECTED: [#]
> 2015-01-19 09:33:41.871691 [DEBUG] switch_channel.c:488 RECV DTMF #:2000
> 2015-01-19 09:33:41.951681 [DEBUG] mod_spandsp_dsp.c:385 DTMF END DETECTED: [#], duration = 76 ms

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