[Freeswitch-users] mod_spandsp: Inband DTMF not processed

[Nagalenoj H.]

Hi,

I am facing an issue with using Inband DTMFs.

Inband DTMFs are getting detected in switch_rtp.c but then it is not
processed further by mod_spandsp_dsp.c. This issue is inconsistent, for few
calls it is working and not working for few other calls.

For a working call, I'm getting the logs as below,

2014-06-19 21:24:40.334513 [DEBUG] switch_ivr_play_say.c:1682 done playing
file
file_string:///usr/local/freeswitch/sounds/music/switch/2539_SB_welcome_switch.wav!/usr/local/freeswitch/sounds/music/switch/1sec_silence.wav!/usr/local/freeswitch/sounds/music/switch/SB_landing_IVR.wav
2014-06-19 21:24:44.114522 [DEBUG] switch_rtp.c:3793 RTP RECV DTMF 3:1280
2014-06-19 21:24:44.694512 [DEBUG] mod_spandsp_dsp.c:372 DTMF BEGIN
DETECTED: [3]
2014-06-19 21:24:44.854513 [DEBUG] mod_spandsp_dsp.c:384 DTMF END DETECTED:
[3], duration = 165 ms
2014-06-19 21:24:45.434531 [DEBUG] switch_rtp.c:3793 RTP RECV DTMF 9:1280
2014-06-19 21:24:45.994513 [DEBUG] mod_spandsp_dsp.c:372 DTMF BEGIN
DETECTED: [9]
2014-06-19 21:24:46.154514 [DEBUG] mod_spandsp_dsp.c:384 DTMF END DETECTED:
[9], duration = 165 ms
2014-06-19 21:24:47.434530 [DEBUG] switch_rtp.c:3793 RTP RECV DTMF 2:1280
2014-06-19 21:24:48.034523 [DEBUG] mod_spandsp_dsp.c:372 DTMF BEGIN
DETECTED: [2]
2014-06-19 21:24:48.034523 [CRIT] sb_main.js:390 digits pressed after
collect input: 392

On the failure calls, I'm getting only the RTP RECV DTMF log and not the
DTMF BEGIN and DTMF END DETECTED log messages and because of this, dialplan
application is not receiving any DTMFs.

I've attached the pcap file and full fs log for failure call.

What could be the cause of this inconsistent behavior? Kindly help me to
rectify this.

-- 
Regards,
Nagalenoj H.
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