Hi. I have a rather simple case: SIP client calls FreeSwitch, then IVR lua script is being executed. In IVR script I do the following logic (in pseudo code): session:answer(); while session:isReady() then do http request to external service if response is ok then session:execute("deflect", "some other SIP URI"); else do some other logic end end In dialplan I have something like this: <extension name="xxx"> <condition field="destination_number" expression="^\d+$"> <action application="set" data="default_language=ru"/> <action application="lua" data="/etc/freeswitch/scripts/ivr/main.lua"/> </condition> </extension> SIP message flow looks like following: INVITE --> <-- Trying <-- OK with SDP ACK --> <-- REFER

From my understanding of SIP (which obviously may be wrong:)) I expect session to become ready (session:isReady returns true) only after FreeSwitch receives ACK from SIP client. But seems that it's not so, because if I introduce small delay in SIP client before sending ACK it receives REFER before ACK is being send to FreeSwitch.

So as result I have several questions: - Is it expected that FreeSwitch doesn't wait for ACK? - Are the any options to change default behaviour expect introducing some seconds delay after session is answered? -- Best regards.