To FreeSWITCH Users, I managed to find and fix the issue and thought I would provide my solution here since it may help someone else. Prior to the recording I set the following inside my outbound Lua script: session:setVariable("record_fill_cng","1400") Note: 1400 matches the waste_resources default setting inside the switch_ivr_record_file (switch_ivr_play_say.c) This fixed the issue and now my recording contains the silence periods correctly (which is what I was after). I also noticed that since the Lua destination script that my outbound was calling contains periods of session:sleep(...), when waiting for DTMF, and it was this period that was not being recorded. Now with this fix everything is fine and those periods of session:sleep(...) are matched inside my outbound recorded audio file. Andrew --- My original e-mail to FreeSWITCH Users --- To FreeSWITCH Users, I am attempting to make a recording of an outbound call using the originate API call which starts a Lua script which then simply records to disk exactly what it hears. I just noticed an interesting issue (or feature) where the recording skips any silence. What I am aiming for is for no silence to be skipped inside the recording, if someone can provide some settings for me to try I would be more than happy to experiment further. The settings for the Lua session:recordFile are length of recording: 60 seconds; silence threshold: 300; silence seconds: 60 seconds {essentially termination on silence is disabled since the silence seconds = recording seconds} I also tried with silence threshold = 0 and silence is still skipped inside the recording. I also tried the setting inside the appropriate profile: <param name="suppress-cng" value="true"/> and this made no difference, silence is still skipped inside the recording. My setup is one single FreeSWITCH 1.6.20 (production version) box with a simple internal gateway setup to land on the same FreeSWITCH IVR (just for testing). API command: originate {origination_uuid=121e20a6-1245-439a-8527-53efab009334-out-1,origination_caller_id_number=FLOODOUT,call_timeout=15,ignore_early_media=true,return_ring_ready=true,suppress_cng=true}sofia/gateway/visytel-pc-ivr/01111111111 FLOODOUT The SDP inside my log is similar to this for the outbound and inbound (Note: The outbound call is performing the recording): 121e20a6-1245-439a-8527-53efab009334-out-1 Local SDP: 121e20a6-1245-439a-8527-53efab009334-out-1 v=0 121e20a6-1245-439a-8527-53efab009334-out-1 o=FreeSWITCH 1529274701 1529274702 IN IP4 192.168.15.15 121e20a6-1245-439a-8527-53efab009334-out-1 s=FreeSWITCH 121e20a6-1245-439a-8527-53efab009334-out-1 c=IN IP4 192.168.15.15 121e20a6-1245-439a-8527-53efab009334-out-1 t=0 0 121e20a6-1245-439a-8527-53efab009334-out-1 m=audio 25994 RTP/AVP 9 8 0 101 121e20a6-1245-439a-8527-53efab009334-out-1 a=rtpmap:9 G722/8000 121e20a6-1245-439a-8527-53efab009334-out-1 a=rtpmap:8 PCMA/8000 121e20a6-1245-439a-8527-53efab009334-out-1 a=rtpmap:0 PCMU/8000 121e20a6-1245-439a-8527-53efab009334-out-1 a=rtpmap:101 telephone-event/8000 121e20a6-1245-439a-8527-53efab009334-out-1 a=fmtp:101 0-16 121e20a6-1245-439a-8527-53efab009334-out-1 a=silenceSupp:off - - - - 121e20a6-1245-439a-8527-53efab009334-out-1 a=ptime:20 121e20a6-1245-439a-8527-53efab009334-out-1 a=sendrecv 6da97c7c-1052-4f78-8dde-83901147a0c1 2018-06-18 15:44:55.596296 [DEBUG] sofia.c:7094 Remote SDP: 6da97c7c-1052-4f78-8dde-83901147a0c1 v=0 6da97c7c-1052-4f78-8dde-83901147a0c1 o=FreeSWITCH 1529274701 1529274702 IN IP4 192.168.15.15 6da97c7c-1052-4f78-8dde-83901147a0c1 s=FreeSWITCH 6da97c7c-1052-4f78-8dde-83901147a0c1 c=IN IP4 192.168.15.15 6da97c7c-1052-4f78-8dde-83901147a0c1 t=0 0 6da97c7c-1052-4f78-8dde-83901147a0c1 m=audio 25994 RTP/AVP 9 8 0 101 6da97c7c-1052-4f78-8dde-83901147a0c1 a=rtpmap:9 G722/8000 6da97c7c-1052-4f78-8dde-83901147a0c1 a=rtpmap:8 PCMA/8000 6da97c7c-1052-4f78-8dde-83901147a0c1 a=rtpmap:0 PCMU/8000 6da97c7c-1052-4f78-8dde-83901147a0c1 a=rtpmap:101 telephone-event/8000 6da97c7c-1052-4f78-8dde-83901147a0c1 a=fmtp:101 0-16 6da97c7c-1052-4f78-8dde-83901147a0c1 a=silenceSupp:off - - - - 6da97c7c-1052-4f78-8dde-83901147a0c1 a=ptime:20 6da97c7c-1052-4f78-8dde-83901147a0c1 Kind Regards, Andrew Keil