[Freeswitch-users] Freeswitch 1.8.2 : Debian Package : sometimes crash when executing nolocal:execute_on_answer lua script.

Julien Terrasson julien.terrasson at gmail.com
Fri Oct 12 10:37:51 UTC 2018

I'm trying to use freeswitch as a transcription gateway :

The goal is to allow a PSTN subscriber (A_party) to call another (B_party)
through freeswitch : freeswitch being used to record and transcript the

This is the scenario i'm trying to acheive :

1/ A_party call freeswitch through a PSTN gateway.

2/ freeswitch execute a lua script (IVRPrompt8.lua) that :
* query the service database
* Initialize few sessions variables
* Play A_party a vocal prompt.
* Attempt to bridge B_party.

3/ When B_party answer, a lua script is called : catchBAnswer2.lua
This script is used to initialise several session variable and play legal
warning to both party.

<extension name="experimental_dialplan">
      <condition field="destination_number" expression="^(\+33XXXXXXXXX)$">

<!-- Play IVR to get the destination number and service parameters -->
<action inline="true" application="lua" data="IVRPrompt8.lua" />

<!-- Set channel record settings -->
<action application="export" data="RECORD_READ_ONLY=true"/>
<action application="export" data="RECORD_STEREO=false"/>

<!-- Free the "#" terminator from other use-->
<action application="set" data="ivr_menu_terminator=none"/>

<action application="export" data="nolocal:execute_on_answer=lua

<!-- Finally bridge the call -->
<action application="bridge"


Sometimes the scenario works just fine, but most of the time it crash when
calling catchBAnswer2.lua, as show the last console logs (DEBUG LEVEL):

2018-10-12 09:42:26.812449 [NOTICE] sofia.c:7304 Pre-Answer
2018-10-12 09:42:26.812449 [DEBUG] switch_channel.c:3482
(sofia/external5090/0665199963) Callstate Change RINGING -> EARLY
2018-10-12 09:42:26.812449 [DEBUG] sofia.c:7291 Channel
sofia/external5090/0665199963 entering state [ready][200]
2018-10-12 09:42:26.812449 [DEBUG] switch_core_media.c:5478 Audio Codec
Compare [PCMA:8:8000:20:64000:1]/[PCMA:8:8000:20:64000:1]
2018-10-12 09:42:26.812449 [DEBUG] switch_core_media.c:5533 Audio Codec
Compare [PCMA:8:8000:20:64000:1] ++++ is saved as a match
2018-10-12 09:42:26.812449 [DEBUG] switch_core_media.c:5394 Set
telephone-event payload to 101 at 8000
2018-10-12 09:42:26.812449 [DEBUG] switch_core_media.c:3781 Set Codec
sofia/external5090/0665199963 PCMA/8000 20 ms 160 samples 64000 bits 1
2018-10-12 09:42:26.812449 [DEBUG] switch_core_codec.c:111
sofia/external5090/0665199963 Original read codec set to PCMA:8
2018-10-12 09:42:26.812449 [DEBUG] switch_core_media.c:5737 Set
telephone-event payload to 101 at 8000
2018-10-12 09:42:26.812449 [DEBUG] switch_core_media.c:5795
sofia/external5090/0665199963 Set 2833 dtmf send payload to 101 recv
payload to 101
2018-10-12 09:42:26.812449 [DEBUG] switch_core_media.c:8511 AUDIO RTP
[sofia/external5090/0665199963] port 29498 ->
port 59684 codec: 8 ms: 20
2018-10-12 09:42:26.812449 [DEBUG] switch_rtp.c:4300 Starting timer [soft]
160 bytes per 20ms
2018-10-12 09:42:26.812449 [DEBUG] switch_core_media.c:8815
sofia/external5090/0665199963 Set 2833 dtmf send payload to 101
2018-10-12 09:42:26.812449 [DEBUG] switch_core_media.c:8822
sofia/external5090/0665199963 Set 2833 dtmf receive payload to 101
2018-10-12 09:42:26.812449 [DEBUG] switch_core_media.c:8845
sofia/external5090/0665199963 Set rtp dtmf delay to 40
2018-10-12 09:42:26.812449 [NOTICE] sofia.c:8429 Channel
[sofia/external5090/0665199963] has been answered
EXECUTE sofia/external5090/0665199963 lua(catchBAnswer2.lua)


I have no clues why this is happening, so i included the backtrack enclosed
to have feedbacks (https://freeswitch.org/jira/browse/FS-11456).

Can somebody have a look and give a more precise idea on what is making
freeswitch to crash ?

I can then setup monitoring and collect additional traces if needed (SIP,
RTP, etc..).

J. Terrasson
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