[Asterisk-Dev] VoIP Call Sniffer

[Daniel Pocock]

I've seen a similar program that also sniffs G.729.  In fact, the codec 
you are sniffing has no effect on the performance of the sniffer, if you 
are willing to decode the calls later.

Anyone who is worried about this should see http://www.openswan.org

I'm sure you could feed output from tcpdump or ethereal into something 
like this, to get raw compressed audio:

http://www.cs.columbia.edu/IRT/software/rtptools/

You would then take the raw compressed audio and feed it into a command 
line decoder for G.729/G.723.1/iLBC/whatever, and you would get a WAV file.


João Amaro wrote:

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> Hi,
>
> Maybe this is not the right place to post this message, and maybe this
> is not any "fresh" new, but, here it goes.
> I received this e-mail today, and i'm forwarding it to this mailing list.
>
> The Bad News:
>
> | VoIPong is a utility which detects all Voice Over IP calls on a
> | pipeline, and for those which are G711 encoded, dumps actual
> | conversation to seperate wave files. It supports SIP, H323, Cisco's
> |  Skinny Client Protocol, RTP and RTCP.
> |
> | It's been written in C language for performance reasons, proved to
> | be running on Solaris, Linux and FreeBSD; though it's thought to
> | compile and run on other platforms as well.
> |
> | On a 45 Mbit/sec actual network traffic, it's been verified that
> | VoIPong successfully detected all VoIP gateways and the VoIP calls.
> |  CPU utilization during the run has been found ranging between 66%
> | - 80% on a 256MB RAM, Celeron 1700 Mhz Toshiba notebook.
> |
>
> Regards,
>
> ~                João Amaro
>
>
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