[Freeswitch-users] intermittent DTMF duplicate digit detection

Wed Sep 7 16:15:00 MSD 2016

Sorry my original email had so many typos.

Thanks for this suggestion.

I was trying to figure out how to do this exact change to use rfc2833, none or inband to see if it impacted this issue…I was not sure where to make this change…are you suggesting I remove the line to “spandsp_start_dtmf” or is dtmf-type an option for spandsp?  I did not see any options for spandsp that mention 2833 so I figured this was something someplace else.

I have tried removing the spandsp_start_dtmf and adding setting dtmf-type=rfc2833 followed by start_dtmf and I still see my dialed DTMF digits receiving twice and sometimes three times…sometimes I only get the digit once (what I would expect when I only press the button once).  I have tried removing start_dtmf and leaving the dtmf-type=rfc2833

I also tried dtmf-type=inband but so no improvement.

I have tried setting dtmf-type=junk to see if I would get an error message or something to indicate I am putting the parameter in the correct place…but do not see any error…this seems to get submitted as the call processes and does not seem to change anything.

Is there a debug level or log setting that would confirm if I switch to rfc2833 or inband that freeswitch is indeed working as rfc2833 or inband?

If I could figure out how to disable whatever the switch_rtp.c message indicates on the log DTMF processing…that would seem to address my issue.

Thanks in advance for any help you can provide.

From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Guillermo Ruiz Camauer
Sent: Saturday, September 03, 2016 09:14
To: FreeSWITCH Users Help
Subject: Re: [Freeswitch-users] intermittent DTMF duplicate digit detection

Can you try with RFC-2833 inste as of inband?

Guillermo

Sent from my iPhone

On Sep 3, 2016, at 01:20, Jeff Crews <jeff at eoni.com<mailto:jeff at eoni.com>> wrote:
I am running
FreeSWITCH Version 1.6.6~64bit ( 64bit) running in a non-virtualized hardware platform.  I am using it with FusionPBX (roughly 2 weeks since my last git pull)

When using a SIP trunk from my CopperCom IP card I get intermittent duplicate DTMF digits specifically causing me trouble using the IVR application.

With these options on:

dtmf_verbose=true

spandsp_dtmf_rx_threshold=-42

spandsp_dtmf_rx_twist=8

spandsp_dtmf_rx_reverse_twist=6

min_dup_digit_spacing_ms=50
(I have adjusted this from 0 to values of upwards of 2000…not sure it applies in this case as I think the duplicate digits might not be impacted by this value as I think two different systems are detecting the DTMF).

In the following logs the min_dup_digit_spacing_ms might have been any number of values I was testing.

So…on a properly recognized DTMF digit the logs look like this when I placed a test call to the IVR and dialed 9 as a menu option for the company directory then 489 to successfully to search for a name…in this call all worked as expected:

b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:32:53.113751 [DEBUG] switch_core_media.c:4485 sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Set 2833 dtmf send payload to 101 recv payload to 101
b6fe5cc0-717e-11e6-a586-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> parsing [public->dtmf-type] continue=true
b6fe5cc0-717e-11e6-a586-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Regex (PASS) [dtmf-type] () =~ // break=on-false
b6fe5cc0-717e-11e6-a586-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Action set(dtmf_verbose=true)
b6fe5cc0-717e-11e6-a586-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Action set(spandsp_dtmf_rx_threshold=-42)
b6fe5cc0-717e-11e6-a586-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Action set(spandsp_dtmf_rx_twist=8)
b6fe5cc0-717e-11e6-a586-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Action set(spandsp_dtmf_rx_reverse_twist=6)
b6fe5cc0-717e-11e6-a586-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Action spandsp_start_dtmf()
b6fe5cc0-717e-11e6-a586-0360625ff113 EXECUTE sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> set(dtmf_verbose=true)
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:32:53.133718 [DEBUG] mod_dptools.c:1498 SET sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> [dtmf_verbose]=[true]
b6fe5cc0-717e-11e6-a586-0360625ff113 EXECUTE sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> set(spandsp_dtmf_rx_threshold=-42)
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:32:53.133718 [DEBUG] mod_dptools.c:1498 SET sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> [spandsp_dtmf_rx_threshold]=[-42]
b6fe5cc0-717e-11e6-a586-0360625ff113 EXECUTE sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> set(spandsp_dtmf_rx_twist=8)
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:32:53.133718 [DEBUG] mod_dptools.c:1498 SET sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> [spandsp_dtmf_rx_twist]=[8]
b6fe5cc0-717e-11e6-a586-0360625ff113 EXECUTE sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> set(spandsp_dtmf_rx_reverse_twist=6)
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:32:53.133718 [DEBUG] mod_dptools.c:1498 SET sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> [spandsp_dtmf_rx_reverse_twist]=[6]
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:32:53.133718 [DEBUG] switch_core_session.c:2628 Application spandsp_start_dtmf Requires media! pre_answering channel sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d>
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:32:53.133718 [DEBUG] switch_core_media.c:6332 sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Set 2833 dtmf send payload to 101
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:32:53.133718 [DEBUG] switch_core_media.c:6339 sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Set 2833 dtmf receive payload to 101
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:32:53.133718 [DEBUG] switch_core_media.c:6362 sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Set rtp dtmf delay to 40
b6fe5cc0-717e-11e6-a586-0360625ff113 EXECUTE sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> spandsp_start_dtmf()
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:00.973723 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially D - total -18.52dB, row -35.24dB, col -32.15dB, duration 62628 - miss
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:00.993716 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -2.97dB, row -5.18dB, col -5.09dB, duration 62730 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:00.993716 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -2.94dB, row -5.03dB, col -5.06dB, duration 62832 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:00.993716 [DEBUG] mod_spandsp_dsp.c:375 DTMF BEGIN DETECTED: [9]
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:00.993716 [INFO] switch_channel.c:512 RECV DTMF 9:2000
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:01.013719 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -3.03dB, row -5.21dB, col -5.28dB, duration 102 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:01.013719 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -3.02dB, row -5.29dB, col -5.13dB, duration 204 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:01.033720 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -2.92dB, row -5.03dB, col -5.03dB, duration 306 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:01.053716 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -2.97dB, row -5.08dB, col -5.22dB, duration 408 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:01.053716 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -9.02dB, row -17.52dB, col -16.96dB, duration 510 - miss
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:01.073716 [DEBUG] mod_spandsp_dsp.c:387 DTMF END DETECTED: [9], duration = 76 ms
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.093756 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially D - total -19.84dB, row -34.97dB, col -34.04dB, duration 48144 - miss
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.113726 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -2.80dB, row -4.77dB, col -4.77dB, duration 48246 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.113726 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -2.92dB, row -5.02dB, col -5.03dB, duration 48348 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.113726 [DEBUG] mod_spandsp_dsp.c:375 DTMF BEGIN DETECTED: [4]
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.113726 [INFO] switch_channel.c:512 RECV DTMF 4:2000
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.133730 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -3.14dB, row -5.55dB, col -5.42dB, duration 102 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.133730 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -2.77dB, row -4.66dB, col -4.80dB, duration 204 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.153730 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -3.25dB, row -5.70dB, col -5.63dB, duration 306 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.173727 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -2.79dB, row -4.84dB, col -4.70dB, duration 408 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.173727 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -2.92dB, row -5.00dB, col -5.05dB, duration 510 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.193720 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -4.11dB, row -7.36dB, col -7.35dB, duration 612 - miss
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.213719 [DEBUG] mod_spandsp_dsp.c:387 DTMF END DETECTED: [4], duration = 89 ms
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.313724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 8 - total -3.95dB, row -7.12dB, col -7.00dB, duration 918 - miss
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.333719 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 8 - total -3.10dB, row -5.44dB, col -5.32dB, duration 1020 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.353724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 8 - total -2.99dB, row -5.15dB, col -5.16dB, duration 1122 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.353724 [DEBUG] mod_spandsp_dsp.c:375 DTMF BEGIN DETECTED: [8]
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.353724 [INFO] switch_channel.c:512 RECV DTMF 8:2000
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.353724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 8 - total -2.85dB, row -4.84dB, col -4.94dB, duration 102 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.373724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 8 - total -2.90dB, row -5.02dB, col -4.93dB, duration 204 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.393724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 8 - total -2.98dB, row -5.22dB, col -5.11dB, duration 306 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.393724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 8 - total -3.11dB, row -5.32dB, col -5.43dB, duration 408 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.413724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 8 - total -3.09dB, row -5.33dB, col -5.39dB, duration 510 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.413724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially * - total -13.19dB, row -24.69dB, col -24.21dB, duration 612 - miss
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.433724 [DEBUG] mod_spandsp_dsp.c:387 DTMF END DETECTED: [8], duration = 89 ms
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.473724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -9.05dB, row -17.46dB, col -17.13dB, duration 306 - miss
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.493719 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -2.97dB, row -5.12dB, col -5.12dB, duration 408 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.493719 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -2.96dB, row -5.16dB, col -5.06dB, duration 510 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.493719 [DEBUG] mod_spandsp_dsp.c:375 DTMF BEGIN DETECTED: [9]
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.493719 [INFO] switch_channel.c:512 RECV DTMF 9:2000
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.513724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -8.91dB, row -16.92dB, col -17.15dB, duration 102 - miss
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.533724 [DEBUG] mod_spandsp_dsp.c:387 DTMF END DETECTED: [9], duration = 25 ms
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.553724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -5.06dB, row -9.31dB, col -9.33dB, duration 204 - miss
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.573734 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -2.98dB, row -5.04dB, col -5.19dB, duration 306 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.573734 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -2.93dB, row -5.14dB, col -4.99dB, duration 408 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.573734 [DEBUG] mod_spandsp_dsp.c:375 DTMF BEGIN DETECTED: [9]
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.573734 [INFO] switch_channel.c:512 RECV DTMF 9:2000
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.593730 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -3.02dB, row -5.28dB, col -5.20dB, duration 102 - hit
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.593730 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 9 - total -11.08dB, row -21.34dB, col -21.19dB, duration 204 - miss
b6fe5cc0-717e-11e6-a586-0360625ff113 2016-09-02 19:33:07.613728 [DEBUG] mod_spandsp_dsp.c:387 DTMF END DETECTED: [9], duration = 38 ms

this time I dialed the same menu and dialed 4 and got invalid entry (which digit I dial to cause the intermittent failure seems to be nearly any digit):
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:18.513757 [DEBUG] switch_core_media.c:4485 sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Set 2833 dtmf send payload to 101 recv payload to 101
0da6c076-717f-11e6-a732-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> parsing [public->dtmf-type] continue=true
0da6c076-717f-11e6-a732-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Regex (PASS) [dtmf-type] () =~ // break=on-false
0da6c076-717f-11e6-a732-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Action set(dtmf_verbose=true)
0da6c076-717f-11e6-a732-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Action set(spandsp_dtmf_rx_threshold=-42)
0da6c076-717f-11e6-a732-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Action set(spandsp_dtmf_rx_twist=8)
0da6c076-717f-11e6-a732-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Action set(spandsp_dtmf_rx_reverse_twist=6)
0da6c076-717f-11e6-a732-0360625ff113 Dialplan: sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Action spandsp_start_dtmf()
0da6c076-717f-11e6-a732-0360625ff113 EXECUTE sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> set(dtmf_verbose=true)
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:18.513757 [DEBUG] mod_dptools.c:1498 SET sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> [dtmf_verbose]=[true]
0da6c076-717f-11e6-a732-0360625ff113 EXECUTE sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> set(spandsp_dtmf_rx_threshold=-42)
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:18.513757 [DEBUG] mod_dptools.c:1498 SET sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> [spandsp_dtmf_rx_threshold]=[-42]
0da6c076-717f-11e6-a732-0360625ff113 EXECUTE sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> set(spandsp_dtmf_rx_twist=8)
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:18.513757 [DEBUG] mod_dptools.c:1498 SET sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> [spandsp_dtmf_rx_twist]=[8]
0da6c076-717f-11e6-a732-0360625ff113 EXECUTE sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> set(spandsp_dtmf_rx_reverse_twist=6)
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:18.513757 [DEBUG] mod_dptools.c:1498 SET sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> [spandsp_dtmf_rx_reverse_twist]=[6]
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:18.513757 [DEBUG] switch_core_session.c:2628 Application spandsp_start_dtmf Requires media! pre_answering channel sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d>
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:18.533724 [DEBUG] switch_core_media.c:6332 sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Set 2833 dtmf send payload to 101
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:18.533724 [DEBUG] switch_core_media.c:6339 sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Set 2833 dtmf receive payload to 101
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:18.533724 [DEBUG] switch_core_media.c:6362 sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> Set rtp dtmf delay to 40
0da6c076-717f-11e6-a732-0360625ff113 EXECUTE sofia/internal/541xxxyyyy at a.b.c.d<mailto:sofia/internal/541xxxyyyy at a.b.c.d> spandsp_start_dtmf()
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.593744 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -4.41dB, row -8.03dB, col -8.02dB, duration 32538 - miss
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.593744 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -2.73dB, row -4.71dB, col -4.59dB, duration 32640 - hit
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.693734 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -4.19dB, row -7.59dB, col -7.55dB, duration 33354 - miss
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.713723 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -3.25dB, row -5.68dB, col -5.62dB, duration 33456 - hit
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.713723 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -2.76dB, row -4.65dB, col -4.79dB, duration 33558 - hit
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.713723 [DEBUG] mod_spandsp_dsp.c:375 DTMF BEGIN DETECTED: [4]
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.713723 [INFO] switch_channel.c:512 RECV DTMF 4:2000
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.733724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -3.18dB, row -5.61dB, col -5.47dB, duration 102 - hit
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.753724 [DEBUG] switch_rtp.c:6874 RTP RECV DTMF 4:800
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.753724 [INFO] switch_channel.c:512 RECV DTMF 4:800
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.753724 [DEBUG] mod_spandsp_fax.c:276 FLOW DTMF Potentially 4 - total -3.76dB, row -6.65dB, col -6.69dB, duration 204 - hit
0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.793718 [DEBUG] mod_spandsp_dsp.c:387 DTMF END DETECTED: [4], duration = 51 ms

Whenever I have problems with duplicate digits as in the later example above I always get a line with switch_rtp.c like this:

0da6c076-717f-11e6-a732-0360625ff113 2016-09-02 19:35:22.753724 [DEBUG] switch_rtp.c:6874 RTP RECV DTMF 4:800

If one of the switch_rtp lines does not show up in the output put that it RECV DTMF the DTMF is recognized properly.

Is there an option that I can set to tell the switch_rtp.c to ignore receiving DTMF?

I do not know happens that causes some calls to work and some calls to not work.

I was not sure if when it is intermittent (sometimes 80% get duplicate DTMF, sometimes only 20% get duplicate DTMF) what else to try.

I saw this:
https://freeswitch.org/confluence/display/FREESWITCH/RTP+Issues
and was not sure if this applied…or where options like:
<param name="auto-rtp-bugs" value="clear"/>
Were supposed to be placed in the dial plan to get these in the right place.  Is this part of the options before you invoke action=spandsp_start_dtmf

Thanks in advance for any help you can provide.

Jeff
-.-. --.- -.. . -.- . --... --.- -.-- ..-

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