To FreeSWITCH users,

After progressing with Lua inside FreeSWITCH I have a question that I cannot source an answer for within the current FreeSWITCH documentation.

I have a requirement for an external application to process an event (via the event socket layer) then return the results back to the application while an audio file is played back in a loop to the caller.

From the current documentation this method allows for the event to be sent then the return event is “consumed” using a polling approach.  However the caller is listening to silence.

function poll()

    -- create event and listener

    local event = freeswitch.Event("CUSTOM", "ping::running?")

    local con = freeswitch.EventConsumer("CUSTOM", "ping::running!")

    -- add text ad libitum

    event:addHeader("hi", "there")

    -- fire event

    event:fire()

    -- and wait for reply but not very long

                local retevent = con:pop(1, 5000)

    if retevent then

        print("reply received")

                                freeswitch.consoleLog("DEBUG",  string.format("reply received: %s\n",retevent:getHeader("Result")))

        return true

    end

    print("no reply")

                freeswitch.consoleLog("DEBUG", "no reply\n")

    return false

end

Some questions:

1) Is there a way to playback audio (eg. session:streamFile(…)) while this takes place, since currently session:streamFile(…) seems to be a blocking function (ie. Finishes when the audio file is played back completely)?

2) Is there a way to use session:setInputCallback(…) to handle an external CUSTOM event being returned (since this would then be able to interrupt the session:streamFile(…) just like it does for DTMF or speech recognition)?

If you have a preferred approach to solving this then I am open to your suggestions.

I appreciate any assistance that you can give.

Kind Regards,

Andrew Keil