Hello Michael, Thank you for the helping hand but this does not work for me. This is my test code which rings my extension and after I answer there is 4 secoud silence. I still see the DTMF in the SIP messages on the soft phone debug trace but no audiable DTMF. What could be wrong here please? session=freeswitch.Session("user/1001") log.i("Leg B's UUID: " .. tostring(session:getVariable("uuid"))) if(session:ready()) then log.i("Leg ready") else log.e("Leg does not ready") end session:execute("start_dtmf_generate") session:sleep(1000) session:execute("send_dtmf", 1) session:sleep(1000) session:execute("send_dtmf", 2) session:sleep(1000) session:execute("send_dtmf", 3) session:sleep(1000) Related freeswitch log snippet: EXECUTE sofia/internal/1001@x.y.1.2:5060 start_dtmf_generate() 2016-11-10 20:03:08.179963 [DEBUG] switch_core_media_bug.c:828 Attaching BUG to sofia/internal/1001@x.y.1.2:5060 2016-11-10 20:03:08.239952 [DEBUG] switch_rtp.c:6694 Correct audio ip/port confirmed. 2016-11-10 20:03:08.239952 [DEBUG] switch_core_io.c:448 Setting BUG Codec PCMA:8 EXECUTE sofia/internal/1001@x.y.1.2:5060 send_dtmf(1) 2016-11-10 20:03:09.199949 [DEBUG] switch_core_io.c:1894 sofia/internal/1001@x.y.1.2:5060 send dtmf digit=1 ms=250 samples=2000 EXECUTE sofia/internal/1001@10.8.1.2:5060 send_dtmf(2) 2016-11-10 20:03:10.199951 [DEBUG] switch_core_io.c:1894 sofia/internal/1001@x.y.1.2:5060 send dtmf digit=2 ms=250 samples=2000 EXECUTE sofia/internal/1001@10.8.1.2:5060 send_dtmf(3) 2016-11-10 20:03:11.199963 [DEBUG] switch_core_io.c:1894 sofia/internal/1001@x.y.1.2:5060 send dtmf digit=3 ms=250 samples=2000 Thank you in advance! Zsotya Idézet (Michael Jerris <mike@jerris.com>):

https://freeswitch.org/confluence/display/FREESWITCH/mod_dptools:+start_dtmf... <https://freeswitch.org/confluence/display/FREESWITCH/mod_dptools:+start_dtmf_generate>

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On Nov 9, 2016, at 5:42 PM, Zsotya <zsotya@jss.hu> wrote:

Hello All,

I am trying to send audiable in-band DTMF from Lua script. If I use the session:execute("send_dtmf", 1) command I can see #1 arrives to the other party in SIP messages but I cannot hear the DTMF audio.

How can I set the type of the DTMF? Can I force from lua or is it a gateway or global settings? If I need an audiable DTMF is there any better way than play dtmf sounds from wav files?