[Freeswitch-users] Problems with wait_for_silence API call

[Michael Jerris]

Can you please submit a pull request for these changes so they can be reviewed?

> On Jun 9, 2016, at 5:14 PM, Matthew <matthew at brightfire.net> wrote:
> 
> Hello All,
> 
> After poking around a bit more I realized is that wait_for_silence was 
> never actually waiting for silence. It needs to detect non-silence 
> before it will ever try to detect silence. That makes it quite useless 
> if you call the function from a point where you can't guarantee that 
> audio is being received :/ What I did was broke up the function into two 
> smaller functions ...
> 
> detect_audio <threshold> <audio_hits> <timeout_ms> [<file>]
> detect_silence <threshold> <silence_hits> <timeout_ms> [<file>]
> 
> This allowed me the flexibility I needed to build an outbound dial 
> solution the way I wanted to. For example, I can now do ...
> 
>   amd_detect = "person"
>   dialout_session:execute( "voice_start" )
>   -- wait up to 3 seconds for 5 frames of audio above threshold 300
>   dialout_session:execute( "detect_audio", "300 5 3000" )
>   detect_audio_timeout = dialout_session:getVariable( 
> "detect_audio_timeout" )
>   dialout_session:consoleLog( "INFO", "dialout: detect_audio_timeout = 
> " .. detect_audio_timeout )
>   -- if audio was detected, wait up to 30 seconds for 30 frames of 
> silence below threshold 300
>   if detect_audio_timeout == "false" then
>     dialout_session:execute( "detect_silence", "300 30 30000" )
>   end
>   dialout_session:execute( "voice_stop" )
>   if( dialout_session:getVariable( "amd_status" ) ~= nil ) then
>     amd_detect = dialout_session:getVariable( "amd_status" )
>   end
>   dialout_session:consoleLog( "INFO", "dialout: amd_detect = " .. 
> amd_detect )
>   if amd_detect == "machine" then
>     ...
>   else
>    ...
>   end
> 
> I have patches based on a current git repo. Should I submit those 
> somewhere for inclusion upstream for other people to use or should I 
> just maintain these locally?
> 
> Thanks,
> 
> -Matthew
> 
> On 6/8/2016 4:05 PM, Matthew wrote:
>> Hello All,
>> 
>> I've having a problem with the wait_for_silence API call in lua. When I
>> attempt to orginate a call and then check for silence on the line, I'm
>> getting unpredictable results. Sometimes it seems to work, but more
>> times than not it times out ( switch_ivr_wait_for_silence: TIMEOUT 0 ).
>> To test this, I answer the call, speak a short greeting and then mute
>> the handset. In other words, I know the script should be detecting
>> silence on the other end of the call. Here is a good portion of the test
>> script I'm using ...
>> 
>> local cid_name   = argv[1]
>> local cid_number = argv[2]
>> local gw_string  = argv[3]
>> local queue_ext  = argv[4]
>> 
>> dialout_string =
>>    "{origination_caller_id_name='" .. cid_name .. "'," ..
>>    "origination_caller_id_number=" .. cid_number .. "," ..
>>    "ignore_early_media=true}" .. gw_string
>> 
>> dialout_session = freeswitch.Session( dialout_string )
>> 
>> while dialout_session:ready() and not dialout_session:answered() do
>>    freeswitch.msleep( 250 )
>> end
>> 
>> if dialout_session:ready() and dialout_session:answered() then
>> 
>>    dialout_session:consoleLog( "INFO", "dialout: connected to " ..
>> gw_string ) )
>> 
>>    dialout_session:execute( "voice_start" )
>>    dialout_session:sleep( 2000 )
>>    dialout_session:execute( "wait_for_silence", "300 30 15 15000" )
>>    dialout_session:execute( "voice_stop" )
>> 
>>    dialout_session:consoleLog( "INFO", "dialout: amd_detect = " ..
>> amd_detect )
>> 
>> end
>> 
>> And here is an example of how I would invoke the script ...
>> 
>> luarun dialout.lua TEST 1234567890 sofia/gateway/twilio/+1234567890 7000
>> 
>> Any ideas why the wait_for_silence API call would be misbehaving? Any
>> suggestions on how I could debug this problem further?
>> 
>> Thanks,
>> 
>> -Matthew