[Freeswitch-users] spandsp_start_dtmf detects # key many times

[Nagalenoj H.]

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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