Hi, I am using FreeSWITCH (version 1.10.2-release-14-f7bdd3845a ~ 64bit), the system handles 30-70 simultaneous calls. On the other hand, we have an IVR system that uses the node-esl library to connect to FreeSWITCH. The problem we have is that some calls are dropped at different stages of the IVR menu, and in the FS log we see the following. In this case, a connection with the IVR was not established: 2021-12-15 13:31:43.332652 [DEBUG] sofia.c:7301 Channel sofia/external/ XXXXXXXXXX@sip.telnyx.com entering state [early][183] 2021-12-15 13:31:43.332652 [DEBUG] switch_core_media_bug.c:970 Attaching BUG to sofia/external/XXXXXXXXXX@sip.telnyx.com EXECUTE [depth=0] sofia/external/XXXXXXXXXX@sip.telnyx.com set_audio_level(read 0) EXECUTE [depth=0] sofia/external/XXXXXXXXXX@sip.telnyx.com socket( 127.0.0.1:8085 async full) 2021-12-15 13:31:43.332652 [NOTICE] mod_event_socket.c:450 Trying host: 127.0.0.1:8085 2021-12-15 13:31:43.332652 [ERR] mod_event_socket.c:484 Socket Error: Connection refused 2021-12-15 13:31:43.332652 [ERR] mod_event_socket.c:488 Socket Error! 2021-12-15 13:31:43.332652 [NOTICE] switch_core_state_machine.c:386 sofia/external/XXXXXXXXXX@sip.telnyx.com has executed the last dialplan instruction, hanging up. 2021-12-15 13:31:43.332652 [NOTICE] switch_core_state_machine.c:388 Hangup sofia/external/XXXXXXXXXX@sip.telnyx.com [CS_EXECUTE] [NORMAL_CLEARING] In this other example I don't see an error with the socket in the log, but the call cuts out just after reproducing this silence: 2021-12-14 21:20:08.732663 [DEBUG] switch_ivr_play_say.c:1933 done playing file silence_stream://250 2021-12-14 21:20:08.732663 [NOTICE] switch_core_state_machine.c:386 sofia/external/XXXXXXXXXX@sip.telnyx.com has executed the last dialplan instruction, hanging up. 2021-12-14 21:20:08.732663 [NOTICE] switch_core_state_machine.c:388 Hangup sofia/external/XXXXXXXXXX@sip.telnyx.com [CS_EXECUTE] [NORMAL_CLEARING] Other example: 2021-12-15 13:08:10.452655 [DEBUG] switch_ivr.c:632 sofia/external/ XXXXXXXXXX@sip.telnyx.com Command Execute [depth=1] play_and_get_digits(0 1 1 0 1234567890 phrase:greeting silence_stream://250 dialed_digits) EXECUTE [depth=1] sofia/external/XXXXXXXXXX@sip.telnyx.com play_and_get_digits(0 1 1 0 1234567890 phrase:greeting silence_stream://250 dialed_digits) 2021-12-15 13:08:10.492654 [DEBUG] switch_ivr.c:632 sofia/external/ XXXXXXXXXX@sip.telnyx.com Command Execute [depth=2] sleep(3000) EXECUTE [depth=2] sofia/external/XXXXXXXXXX@sip.telnyx.com sleep(3000) 2021-12-15 13:08:10.532671 [DEBUG] sofia.c:7301 Channel sofia/external/ XXXXXXXXXX@sip.telnyx.com entering state [ready][200] 2021-12-15 13:08:30.092667 [NOTICE] switch_core_state_machine.c:386 sofia/external/XXXXXXXXXX@sip.telnyx.com has executed the last dialplan instruction, hanging up. 2021-12-15 13:08:30.092667 [NOTICE] switch_core_state_machine.c:388 Hangup sofia/external/XXXXXXXXXX@sip.telnyx.com [CS_EXECUTE] [NORMAL_CLEARING] My impression is that the problem is related to the socket connection between the IVR and FreeSWITCH. The two things are installed on the same server (Linux Debian 10), any idea what could cause this problem?