[Freeswitch-users] spandsp_start_dtmf detects # key many times

Tue Jan 20 10:07:41 MSK 2015

Why not use rfc2833 instead?

Nagalenoj H. <nagalenoj at gmail.com> wrote:

> When I changed the Aastra phone settings to use SIP INFO, am not facing
> this issue. But, when I change it to use RTP for DTMF, then '#' is getting
> detected more times.
> 
> I did a pcap and listened to the audio, I could hear only one tone(beep)
> for each key pressed. Is there anything other configuration to get it
> working in RTP?
> 
> On Mon, Jan 19, 2015 at 10:40 PM, Michael Jerris <mike at jerris.com> wrote:
> 
> > 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 [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 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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> 
> 
> 
> -- 
> Regards,
> Nagalenoj H.
> 
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