Take a look at the Wait_For_Silence module and see if that gives you the required code for what you're trying to do.  I haven't looked at it, but I suspect you can hack something together to make it work in more general terms.  Calling the wait_for_silence module is one thing, since it doesn't generate any audio on its side, but unless you're looking for silence on both the A and B legs at the same time, I worry you'll have issues.

Anyways, my $0.02


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On Thu, Jun 18, 2015 at 2:35 PM, Navin Agarwal <agarwal.navin.rvce@gmail.com> wrote:
Hello Everyone,

I am working on a FreeSWITCH project where I need to detect some features of an on-going call such as a period of silence, low volume and high volume, and report it to the user on-the-fly.

I found a function "is_silence_frame" in "switch_ivr_async.c" which detects if a frame is a silence frame relative to a given threshold. I tried using that but I did not find any difference in the energy levels of frames which were silent and ones in which someone was speaking, so I am not able to use it.

Can someone please help me in understanding how this works or if there is any other code or module that I can use to detect silence, low volume and high volume in an on-going call. Basically the idea is to perform some live analysis of a call and the above three are the ones that I could come up with till now.

Any pointers here will be really appreciated.

Thanks,
Navin Agarwal

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